diff --git a/i18n/de.json b/i18n/de.json
index 7e64ea8d8c..146054b2f0 100644
--- a/i18n/de.json
+++ b/i18n/de.json
@@ -4552,7 +4552,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Ungültige Datei-Ids. Uploads sind auf maximal zehn Dateien begrenzt. Bitte verwenden Sie zusätzliche Nachrichten für mehr Dateien."
+    "translation": "Ungültige Datei-Ids. Uploads sind auf maximal fünf Dateien begrenzt. Bitte verwenden Sie zusätzliche Nachrichten für mehr Dateien."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/en.json b/i18n/en.json
index b3706b19fd..7b6c4adc56 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -7936,7 +7936,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Invalid file ids. Note that uploads are limited to 10 files maximum. Please use additional posts for more files."
+    "translation": "Invalid file ids. Note that uploads are limited to 5 files maximum. Please use additional posts for more files."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/es.json b/i18n/es.json
index 07192c59df..78da0b795a 100644
--- a/i18n/es.json
+++ b/i18n/es.json
@@ -4552,7 +4552,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Identificadores de archivo son inválidos. Toma en cuenta que la carga de archivos está limitado a un máximo de 10 archivos. Por favor utiliza mensajes adicionales para agregar más archivos."
+    "translation": "Identificadores de archivo son inválidos. Toma en cuenta que la carga de archivos está limitado a un máximo de 5 archivos. Por favor utiliza mensajes adicionales para agregar más archivos."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/fr.json b/i18n/fr.json
index 00d6af5eda..67663369de 100644
--- a/i18n/fr.json
+++ b/i18n/fr.json
@@ -4552,7 +4552,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Identifiants de fichier invalide. Notez que les envois sont limités à 10 fichiers maximum. Veuillez utiliser d'autres messages pour envoyer plus de fichiers."
+    "translation": "Identifiants de fichier invalide. Notez que les envois sont limités à 5 fichiers maximum. Veuillez utiliser d'autres messages pour envoyer plus de fichiers."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/it.json b/i18n/it.json
index 488cd988c1..1d607cab44 100644
--- a/i18n/it.json
+++ b/i18n/it.json
@@ -4552,7 +4552,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Id file non valido. I caricamenti sono limitati ad un massimo di 10 file. Utilizzare più pubblicazioni per più file."
+    "translation": "Id file non valido. I caricamenti sono limitati ad un massimo di 5 file. Utilizzare più pubblicazioni per più file."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/ko.json b/i18n/ko.json
index 5256034cd5..e2639528b8 100644
--- a/i18n/ko.json
+++ b/i18n/ko.json
@@ -4547,7 +4547,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Invalid file ids. Note that uploads are limited to 10 files maximum. Please use additional posts for more files."
+    "translation": "Invalid file ids. Note that uploads are limited to 5 files maximum. Please use additional posts for more files."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/nl.json b/i18n/nl.json
index b146812b91..2c665ee30f 100644
--- a/i18n/nl.json
+++ b/i18n/nl.json
@@ -4552,7 +4552,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Invalid file ids. Note that uploads are limited to 10 files maximum. Please use additional posts for more files."
+    "translation": "Invalid file ids. Note that uploads are limited to 5 files maximum. Please use additional posts for more files."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/pl.json b/i18n/pl.json
index 47c1d6ee6e..39676e1609 100644
--- a/i18n/pl.json
+++ b/i18n/pl.json
@@ -4557,7 +4557,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Nieprawidłowe identyfikatory plików. Pamiętaj, że przesłane pliki są ograniczone maksymalnie do 10 plików. Użyj dodatkowych wpisów, aby uzyskać więcej plików."
+    "translation": "Nieprawidłowe identyfikatory plików. Pamiętaj, że przesłane pliki są ograniczone maksymalnie do 5 plików. Użyj dodatkowych wpisów, aby uzyskać więcej plików."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/pt-BR.json b/i18n/pt-BR.json
index ac5bcb3a92..a402e77fba 100644
--- a/i18n/pt-BR.json
+++ b/i18n/pt-BR.json
@@ -4552,7 +4552,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Ids do arquivo inválido. Observe que os uploads estão limitados a dez arquivos no máximo. Por favor, use publicações adicionais para mais arquivos."
+    "translation": "Ids do arquivo inválido. Observe que os uploads estão limitados a cinco arquivos no máximo. Por favor, use publicações adicionais para mais arquivos."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/ro.json b/i18n/ro.json
index a3afdbfd70..5592bbccf3 100644
--- a/i18n/ro.json
+++ b/i18n/ro.json
@@ -4557,7 +4557,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Identitatea fișierului invalidă. Rețineți că încărcările sunt limitate la maxim 10 fișiere. Utilizați postări suplimentare pentru mai multe fișiere."
+    "translation": "Identitatea fișierului invalidă. Rețineți că încărcările sunt limitate la maxim 5 fișiere. Utilizați postări suplimentare pentru mai multe fișiere."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/ru.json b/i18n/ru.json
index e8bf35a401..ab3f858e7d 100644
--- a/i18n/ru.json
+++ b/i18n/ru.json
@@ -4557,7 +4557,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Неверные идентификаторы файлов. Обратите внимание, что загрузка ограничена максимум 10 файлами. Пожалуйста, используйте дополнительные сообщения для большего количества файлов."
+    "translation": "Неверные идентификаторы файлов. Обратите внимание, что загрузка ограничена максимум 5 файлами. Пожалуйста, используйте дополнительные сообщения для большего количества файлов."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/tr.json b/i18n/tr.json
index 3c2511bb79..e5e870286c 100644
--- a/i18n/tr.json
+++ b/i18n/tr.json
@@ -4552,7 +4552,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Dosya kodları geçersiz. Bir iletide en çok 10 dosya yüklenebileceğini unutmayın. Daha fazla dosya yüklemek için ek iletiler gönderin."
+    "translation": "Dosya kodları geçersiz. Bir iletide en çok 5 dosya yüklenebileceğini unutmayın. Daha fazla dosya yüklemek için ek iletiler gönderin."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/uk.json b/i18n/uk.json
index fbf847229b..f137bb338f 100644
--- a/i18n/uk.json
+++ b/i18n/uk.json
@@ -4557,7 +4557,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "Invalid file ids. Note that uploads are limited to 10 files maximum. Please use additional posts for more files."
+    "translation": "Invalid file ids. Note that uploads are limited to 5 files maximum. Please use additional posts for more files."
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/i18n/zh-CN.json b/i18n/zh-CN.json
index 631887e1de..e17d3904eb 100644
--- a/i18n/zh-CN.json
+++ b/i18n/zh-CN.json
@@ -4547,7 +4547,7 @@
   },
   {
     "id": "model.post.is_valid.file_ids.app_error",
-    "translation": "无效的文件 id。上传只允许最多 10 个文件。请考虑创建新的消息以上传更多文件。"
+    "translation": "无效的文件 id。上传只允许最多 5 个文件。请考虑创建新的消息以上传更多文件。"
   },
   {
     "id": "model.post.is_valid.filenames.app_error",
diff --git a/model/post.go b/model/post.go
index 1823b7e2b5..3e31ab246e 100644
--- a/model/post.go
+++ b/model/post.go
@@ -45,8 +45,7 @@ const (
 	POST_EPHEMERAL              = "system_ephemeral"
 	POST_CHANGE_CHANNEL_PRIVACY = "system_change_chan_privacy"
 	POST_ADD_BOT_TEAMS_CHANNELS = "add_bot_teams_channels"
-	POST_MAX_FILES              = 10
-	POST_FILEIDS_MAX_RUNES      = 300
+	POST_FILEIDS_MAX_RUNES      = 150
 	POST_FILENAMES_MAX_RUNES    = 4000
 	POST_HASHTAGS_MAX_RUNES     = 1000
 	POST_MESSAGE_MAX_RUNES_V1   = 4000
@@ -340,12 +339,8 @@ func (o *Post) IsValid(maxPostSize int) *AppError {
 		return NewAppError("Post.IsValid", "model.post.is_valid.filenames.app_error", nil, "id="+o.Id, http.StatusBadRequest)
 	}
 
-	if len(o.FileIds) > POST_MAX_FILES {
-		return NewAppError("Post.IsValid", "model.post.is_valid.file_ids.app_error", nil, "id="+o.Id, http.StatusBadRequest)
-	}
-
 	if utf8.RuneCountInString(ArrayToJson(o.FileIds)) > POST_FILEIDS_MAX_RUNES {
-		return NewAppError("Post.IsValid", "model.post.is_valid.file_ids.app_error", nil, "id="+o.Id, http.StatusInternalServerError)
+		return NewAppError("Post.IsValid", "model.post.is_valid.file_ids.app_error", nil, "id="+o.Id, http.StatusBadRequest)
 	}
 
 	if utf8.RuneCountInString(StringInterfaceToJson(o.GetProps())) > POST_PROPS_MAX_RUNES {
diff --git a/scripts/mattermost-mysql-5.0.sql b/scripts/mattermost-mysql-5.0.sql
index 9b55afb99d..9d51ede22e 100644
--- a/scripts/mattermost-mysql-5.0.sql
+++ b/scripts/mattermost-mysql-5.0.sql
@@ -626,7 +626,7 @@ CREATE TABLE `Posts` (
   `Props` text,
   `Hashtags` text,
   `Filenames` text,
-  `FileIds` varchar(300) DEFAULT NULL,
+  `FileIds` varchar(150) DEFAULT NULL,
   `HasReactions` tinyint(1) DEFAULT NULL,
   PRIMARY KEY (`Id`),
   KEY `idx_posts_update_at` (`UpdateAt`),
diff --git a/scripts/mattermost-postgresql-5.0.sql b/scripts/mattermost-postgresql-5.0.sql
index d8bb0e3391..d6f853340a 100644
--- a/scripts/mattermost-postgresql-5.0.sql
+++ b/scripts/mattermost-postgresql-5.0.sql
@@ -398,7 +398,7 @@ CREATE TABLE public.posts (
     props character varying(8000),
     hashtags character varying(1000),
     filenames character varying(4000),
-    fileids character varying(300),
+    fileids character varying(150),
     hasreactions boolean
 );
 
diff --git a/store/sqlstore/post_store.go b/store/sqlstore/post_store.go
index 8a7327e798..b08d2a04e8 100644
--- a/store/sqlstore/post_store.go
+++ b/store/sqlstore/post_store.go
@@ -86,7 +86,7 @@ func newSqlPostStore(sqlStore *SqlStore, metrics einterfaces.MetricsInterface) s
 		table.ColMap("Hashtags").SetMaxSize(1000)
 		table.ColMap("Props").SetMaxSize(8000)
 		table.ColMap("Filenames").SetMaxSize(model.POST_FILENAMES_MAX_RUNES)
-		table.ColMap("FileIds").SetMaxSize(300)
+		table.ColMap("FileIds").SetMaxSize(150)
 	}
 
 	return s
diff --git a/store/sqlstore/upgrade.go b/store/sqlstore/upgrade.go
index cf9b2a1fc8..41d92b0eb6 100644
--- a/store/sqlstore/upgrade.go
+++ b/store/sqlstore/upgrade.go
@@ -963,7 +963,6 @@ func upgradeDatabaseToVersion531(sqlStore *SqlStore) {
 func upgradeDatabaseToVersion532(sqlStore *SqlStore) {
 	// if shouldPerformUpgrade(sqlStore, Version5310, Version5320) {
 	// allow 10 files per post
-	sqlStore.AlterColumnTypeIfExists("Posts", "FileIds", "text", "varchar(300)")
 	sqlStore.CreateColumnIfNotExists("ThreadMemberships", "UnreadMentions", "bigint", "bigint", "0")
 	sqlStore.CreateColumnIfNotExistsNoDefault("Channels", "Shared", "tinyint(1)", "boolean")
 	sqlStore.CreateColumnIfNotExistsNoDefault("Reactions", "UpdateAt", "bigint", "bigint")