Hi Cris,
Could you confirm if you are using the AdWords API or the AdWords UI in uploading the GIF file? If you are using the AdWords UI, then I would recommend that you get in touch with the product experts at the
AdWords Community Forum as this is already out of scope for our team.
However, if you are also using the AdWords API and encountering an issue uploading GIFs, could you provide the SOAP request and response generated so I can further investigate? You may reply using the Reply privately to author option.
Best regards,
Peter
AdWords API Team