Bugs in content types

Hi,

I've been trying to create an intercative video for the past 2 hours but it seems like 2 hours is not even close to the amount of time it takes for my video to be uploaded. Basically, I've been staring at the "uploading video" loading sign for 2 hours and I feel like I'm not even halfway through it yet. 

I don't know why this is happening, there is nothing wrong with my video's settings, or at least nothing I can think of, like the file being too heavy (it is not, by the way.) 

Hello!
I made a quiz site for kids. It contains only images and dropzones.
The problem is when i want to move an image to the dropzone i need to click twice.
With Google Chrome it works fine.

A video about the problem: https://drive.google.com/open?id=19mMOS4K8Tgd_PC9zbg7kav7I5SOLxiLJ

Excuse my English!

Bonjour,
Je poste dans ce forum sans être sur d'être dans le bon.