I hope to bring this feature in for v.4.4.x update otherwise will be in v5.0.

I haven't come across this myself, however should greatly be improved in v4.4.

I haven't head of Amino before no. If there is more interest then I may consider looking into this some more.

Instagram does support rearrangement however I have disabled this as the posts to too big to be moved around on the timeline. However rearranging them via the Profile is a better idea. I will take a look into this, thanks.