Can't upload .webm (nsfw)

Just finished an animation and am trying to post it, but the upload page keeps throwing errors at me. I’ve successfully uploaded to imgur and e621 so I know the file works.  
These are the errors:  
“Image size can’t be blank  
Image width can’t be blank  
Image height can’t be blank  
Image mime type can’t be blank  
Image orig sha512 hash can’t be blank”
 
Here are the links (explicit!):  
||  
https://imgur.com/4StVdvX  
https://e621.net/posts/2194956  
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Just letting you know that we are aware of your issue report and we will investigate it in the following days.

@Luna  
Any update?

@expatriate.  
We tried uploading it locally and it works. Does it still not work for you?

Uhhhh okay I tried from Chrome and it was fine. Firefox still gives me the same error. Definitely didn’t expect switching browsers to change anything or I would have tried it three weeks ago ¯*(ツ)*/¯
 
Thanks!

@expatriate.  
That is weird. I used Firefox to test.