diff --git a/src/applications/content-entries-app/entry/entry-related/entry-related-handler.ts b/src/applications/content-entries-app/entry/entry-related/entry-related-handler.ts
index e101ed19a3..e984a2cbf5 100644
--- a/src/applications/content-entries-app/entry/entry-related/entry-related-handler.ts
+++ b/src/applications/content-entries-app/entry/entry-related/entry-related-handler.ts
@@ -111,6 +111,11 @@ export class EntryRelatedHandler extends EntryFormWidget
 	    this._relatedFiles.next({ items : [] });
     }
 
+    protected _onValidate(): Observable<{ isValid: boolean }> {
+      const fileTypeValid = this._relatedFiles.getValue().items.every(file => !!file.format);
+      return Observable.of({ isValid: fileTypeValid });
+    }
+
 	protected _onActivate(firstTimeActivating: boolean) {
 		this._entryId = this.data.id;
 		super._showLoader();
@@ -279,37 +284,38 @@ export class EntryRelatedHandler extends EntryFormWidget
     	this._uploadManagement.cancelUpload(file.uploadFileId, true);
 	}
 
-	private _getFormatByExtension(ext: string): KalturaAttachmentType{
-		let format : KalturaAttachmentType = null;
-		switch (ext) {
-			case "doc":
-			case "docx":
-			case "dot":
-			case "pdf":
-			case "ppt":
-			case "pps":
-			case "xls":
-			case "xlsx":
-			case "xml":
-				format = KalturaAttachmentType.document;
-				break;
-			case "gif":
-			case "png":
-			case "jpg":
-			case "jpeg":
-			case "mp3":
-			case "mp4":
-				format = KalturaAttachmentType.media;
-				break;
-			case "txt":
-				format = KalturaAttachmentType.text;
-				break;
-			default:
-				format = KalturaAttachmentType.document;
-				break;
-		}
-		return format;
-	}
+  private _getFormatByExtension(ext: string): KalturaAttachmentType {
+    let format: KalturaAttachmentType = null;
+    ext = typeof ext === 'string' ? ext.toLowerCase() : ext;
+    switch (ext) {
+      case 'doc':
+      case 'docx':
+      case 'dot':
+      case 'pdf':
+      case 'ppt':
+      case 'pps':
+      case 'xls':
+      case 'xlsx':
+      case 'xml':
+        format = KalturaAttachmentType.document;
+        break;
+      case 'gif':
+      case 'png':
+      case 'jpg':
+      case 'jpeg':
+      case 'mp3':
+      case 'mp4':
+        format = KalturaAttachmentType.media;
+        break;
+      case 'txt':
+        format = KalturaAttachmentType.text;
+        break;
+      default:
+        break;
+    }
+
+    return format;
+  }
 
 	public _setDirty(){
 		super._updateWidgetState({isDirty: true});
diff --git a/src/applications/content-entries-app/entry/entry-related/entry-related.component.html b/src/applications/content-entries-app/entry/entry-related/entry-related.component.html
index 03888e5c33..4c9e4d02a1 100644
--- a/src/applications/content-entries-app/entry/entry-related/entry-related.component.html
+++ b/src/applications/content-entries-app/entry/entry-related/entry-related.component.html
@@ -9,7 +9,15 @@
 				</p-column>
 				<p-column header="{{'applications.content.entryDetails.related.type' | translate}}" [style]="{'width':'140px'}">
 					<ng-template let-col let-file="rowData" pTemplate="body">
-						<p-dropdown kDropdownCloseOnScroll [disabled]="file.uploading || file.uploadFailure" [scrollTarget]="related" [options]="_fileTypes" [appendTo]="'body'" [autoWidth]="false" [(ngModel)]="file.format" (onChange)="_handler._setDirty()" placeholder="{{'applications.content.entryDetails.related.select' | translate}}"></p-dropdown>
+						<p-dropdown kDropdownCloseOnScroll
+                        [disabled]="file.uploading || file.uploadFailure"
+                        [scrollTarget]="related"
+                        [options]="_fileTypes"
+                        [appendTo]="'body'"
+                        [autoWidth]="false"
+                        [placeholder]="'applications.content.entryDetails.related.select' | translate"
+                        [(ngModel)]="file.format"
+                        (onChange)="_handler._setDirty()"></p-dropdown>
 					</ng-template>
 				</p-column>
 				<p-column field="size" header="{{'applications.content.entryDetails.related.size' | translate}}">