There may be issues observed during the FamilySync™ feature.
As I know it, the following Media file extensions are Acceptable:
The following Documents are acceptable:
You find the filenames in the Media FOLDER that is associate with the FTM2017 file that you are working on. BUT, you need to be able to see the File Extension in File Explorer.for a Windows Computer:
You will also see the filename and extension in the Media Workspace, Collection Tab or the Detail Tab.with an Media File selected.
These media files will be found in the Gallery of the AMT
Further information can be found on the Ancestry.com Support page
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