Under which ‘category’ are you trying to create a download? Only certain file types are allowed per category…
Here:https://forum.renoise.com/t/help-conceptual-support-in-internal-functioning-renoise-3-1/44557
(Renoise Forums → Renoise 3.1 Beta → Renoise 3.1 - Questions & Suggestions)
ButIt happens in any post.At least to me.
I don’t think it takes gifs, but i’m not shure…
I talk about PNG or JPG. Simples images.