Why am i unable to send gifs from automatic stored in app

[Android Central Question]

I am unable to send gifs from my samsung Galaxy core prime phn keeps saying unable to attach file . It did at 1st but now does not. I cleared default I dwnloaded Google photos moved my photos to that and my reg gallery is empty but still unable to send gifs Can u help me to resolve problem without the possibility of reset setting bcuz I checked that and it would wipe out everything if I do that. Plz help.