@eveh have you tried to change the settings at
ACP > Settings > Uploads ?
try adding .gif to the list...
alternatively, you can use "tenor gif" plugin...
https://community.nodebb.org/topic/11484/nodebb-now-with-gif-support
Gif Making GIF
v 0.6.0
The problem is when uploading images with iphone, the latest image upload reflects previous image upload.
Tested on iphone 4s 5 and 6 browser safari and chrome. While uploading first picture everything seems to
function fine, but after second image is uploaded the first one gets overwritten with second.
Easy to replicate.