Toggling between subbed/local/all/mod view does nothing

and

I just found out posting this that I need to be subscribed to the lemmy.ca support / questions in order to post here.

I can't duplicate your subbed/Local/all view, and I can post here even though I am not subscribed.
Are you using the actual website, or one of the many unofficial apps?

I tried uploading a video but can’t seem to regardless of file size.

Lemmy doesn't host video, you'll need to upload it elsewhere and link to it.