I have dropbox on my S6 Edge. I often take videos of gameplay, which are 150MB. I upload them via Drop box so I can share them.

The problem I have is that for some unknown reason despite having 100MBit upload, the uploads seem to stall. I can't cancel them, pause them or see anyway to force any behaviour at all. 

Does anyone know if there is a secret page in the app for managing uploads? 

I am thinking of dropping dropbox as I generally find uploads very slow, and switching to another app. I like the ability to share a URL link direct to my clipboard, so any replacement would need to be registered as a share target and have that ability.

Cheers