diff --git a/server/platform/shared/filestore/s3store.go b/server/platform/shared/filestore/s3store.go
index a1136767fd..9fabf59fb0 100644
--- a/server/platform/shared/filestore/s3store.go
+++ b/server/platform/shared/filestore/s3store.go
@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"io"
 	"io/fs"
+	"mime"
 	"net/http"
 	"net/url"
 	"os"
@@ -62,28 +63,18 @@ const (
 	invalidBucket  = "InvalidBucketName"
 )
 
-var (
-	imageExtensions = map[string]bool{".jpg": true, ".jpeg": true, ".gif": true, ".bmp": true, ".png": true, ".tiff": true, "tif": true}
-	imageMimeTypes  = map[string]string{".jpg": "image/jpeg", ".jpeg": "image/jpeg", ".gif": "image/gif", ".bmp": "image/bmp", ".png": "image/png", ".tiff": "image/tiff", ".tif": "image/tif"}
-)
-
 var (
 	// Ensure that the ReaderAt interface is implemented.
 	_ io.ReaderAt                  = (*s3WithCancel)(nil)
 	_ FileBackendWithLinkGenerator = (*S3FileBackend)(nil)
 )
 
-func isFileExtImage(ext string) bool {
-	ext = strings.ToLower(ext)
-	return imageExtensions[ext]
-}
-
-func getImageMimeType(ext string) string {
-	ext = strings.ToLower(ext)
-	if imageMimeTypes[ext] == "" {
-		return "image"
+func getContentType(ext string) string {
+	mimeType := mime.TypeByExtension(strings.ToLower(ext))
+	if mimeType == "" {
+		mimeType = "application/octet-stream"
 	}
-	return imageMimeTypes[ext]
+	return mimeType
 }
 
 func (s *S3FileBackendAuthError) Error() string {
@@ -502,11 +493,8 @@ func (b *S3FileBackend) WriteFile(fr io.Reader, path string) (int64, error) {
 func (b *S3FileBackend) WriteFileContext(ctx context.Context, fr io.Reader, path string) (int64, error) {
 	var contentType string
 	path = filepath.Join(b.pathPrefix, path)
-	if ext := filepath.Ext(path); isFileExtImage(ext) {
-		contentType = getImageMimeType(ext)
-	} else {
-		contentType = "binary/octet-stream"
-	}
+	ext := filepath.Ext(path)
+	contentType = getContentType(ext)
 
 	options := s3PutOptions(b.encrypt, contentType, b.uploadPartSize, b.storageClass)
 
@@ -545,12 +533,7 @@ func (b *S3FileBackend) AppendFile(fr io.Reader, path string) (int64, error) {
 		return 0, errors.Wrapf(err2, "unable to find the file %s to append the data", path)
 	}
 
-	var contentType string
-	if ext := filepath.Ext(fp); isFileExtImage(ext) {
-		contentType = getImageMimeType(ext)
-	} else {
-		contentType = "binary/octet-stream"
-	}
+	contentType := getContentType(filepath.Ext(fp))
 
 	options := s3PutOptions(b.encrypt, contentType, b.uploadPartSize, b.storageClass)
 	sse := options.ServerSideEncryption
diff --git a/server/platform/shared/filestore/s3store_test.go b/server/platform/shared/filestore/s3store_test.go
index 3a89caf77f..2c2e8f41d9 100644
--- a/server/platform/shared/filestore/s3store_test.go
+++ b/server/platform/shared/filestore/s3store_test.go
@@ -379,3 +379,78 @@ func TestListDirectory(t *testing.T) {
 	err = fileBackend.RemoveDirectory("19700101")
 	require.NoError(t, err)
 }
+
+func TestWriteFileVideoMimeTypes(t *testing.T) {
+	s3Host := os.Getenv("CI_MINIO_HOST")
+	if s3Host == "" {
+		s3Host = "localhost"
+	}
+
+	s3Port := os.Getenv("CI_MINIO_PORT")
+	if s3Port == "" {
+		s3Port = "9000"
+	}
+
+	s3Endpoint := fmt.Sprintf("%s:%s", s3Host, s3Port)
+
+	// Generate a random bucket name
+	b := make([]byte, 30)
+	rand.Read(b)
+	bucketName := base64.StdEncoding.EncodeToString(b)
+	bucketName = strings.ToLower(bucketName)
+	bucketName = strings.Replace(bucketName, "+", "", -1)
+	bucketName = strings.Replace(bucketName, "/", "", -1)
+
+	cfg := FileBackendSettings{
+		DriverName:                         model.ImageDriverS3,
+		AmazonS3AccessKeyId:                model.MinioAccessKey,
+		AmazonS3SecretAccessKey:            model.MinioSecretKey,
+		AmazonS3Bucket:                     bucketName,
+		AmazonS3Endpoint:                   s3Endpoint,
+		AmazonS3SSL:                        false,
+		AmazonS3RequestTimeoutMilliseconds: 5000,
+	}
+
+	fileBackend, err := NewS3FileBackend(cfg)
+	require.NoError(t, err)
+
+	err = fileBackend.MakeBucket()
+	require.NoError(t, err)
+
+	// Test video types
+	// Test video types with multiple valid MIME types
+	testContent := []byte("test-video-content")
+	videoTypes := map[string][]string{
+		".avi":  {"video/vnd.avi", "video/x-msvideo"},
+		".mpeg": {"video/mpeg"},
+		".mp4":  {"video/mp4"},
+	}
+
+	for ext, validMimeTypes := range videoTypes {
+		t.Run(strings.TrimPrefix(ext, "."), func(t *testing.T) {
+			path := "test" + ext
+			reader := bytes.NewReader(testContent)
+
+			written, err := fileBackend.WriteFile(reader, path)
+			require.NoError(t, err)
+			require.Equal(t, int64(len(testContent)), written)
+
+			// Verify the file exists with correct mime type
+			props, err := fileBackend.client.StatObject(
+				context.Background(),
+				bucketName,
+				path,
+				s3.StatObjectOptions{},
+			)
+			require.NoError(t, err)
+
+			// Ensure the MIME type is one of the expected values
+			assert.Contains(t, validMimeTypes, props.ContentType, "Unexpected MIME type: %s", props.ContentType)
+
+			defer func() {
+				err = fileBackend.RemoveFile(path)
+				require.NoError(t, err)
+			}()
+		})
+	}
+}