I use Tapatalk but it's guaranteed that the 1st four or more attempts will get "upload failed". Usually by the 5th try the pic goes thru. And once the 1st pic finally loads then all subsequent pics will load 1st try without a fail.
It's to the point that I dont wait for the error message. As the 1st attempt is attempting to load, I just add the same pic another 3 times. The 4th usually goes thru.
Frustrating but I don't know of another way to upload pics.