Merge pull request #1645 from owncloud/sync-limitations

added known limitation for sync

modules/admin_manual/pages/faq/index.adoc

@@ -28,3 +28,16 @@ See xref:configuration/user/reset_admin_password.adoc[the reset admin password d
 
 A Federated System is another ownCloud or https://oc.owncloud.com/opencloudmesh.html[OpenCloudMesh]
 supporting cloud service.
+
+== Platform-wide known limitations, excluded files
+
+There are known file names that can not be synced with ownCloud, these are:
+
+* Folders and files with a trailing space.
+* .htaccess.
+* `*.part` files.
+* File names that exceed 253 characters.
+* https://github.com/owncloud/client/blob/master/sync*exclude.lst[client/sync*exclude list].
+* Desktop.ini in the root directory.
+* UNIX/Linux hidden files (files whose names have a leading dot, e.g., `.12345.pdf`). 
+  Users must activate "_sync hidden files_" to sync them.