Hi again @SandraTagliacoz
The exact error message will be really helpful, when it pops up again press the PrtScn button to grab the screenshot and then crop it down. I suspect the message appears for a short time, so you'll have to be quick pressing the button.
For your video submissions, you're adding them through the Rich Content Editor: How do I upload and embed a media file from my com... - Instructure Community - 381 (canvaslms.com) and then answering the rest of the questions rather than submitting it as the only artifact.
Today, I tried out uploading a video into the Rich Content Editor (in a discussion post) using Edge browser. I kept getting upload errors, that video was over 100MB though.
Error uploading media
I went back to my video editing software (ClipChamp) and exported a lower quality video (720p) and got a smaller file, 84MB and tried the upload and embed again. When it did upload it was just spinning on the screen processing, and I waited 2 minutes (even longer than the length of my 1min 14sec video). Eventually, I switched into HTML mode using the </> symbol, saw the place holder message and then flipped back to RCE and the video appeared!
Meanwhile, though if your error happens when you submit and not when you upload, I'm not sure what to think. The Help guide referenced above does suggest hosting large videos on YouTube and then embedding them. This workaround may be your solution if your video file size is larger than expected. Upload your video to YouTube and set the privacy as Unlisted How do I embed media from an external source in th... - Instructure Community - 420817 (canvaslms.co...
Sandra, we will figure this out for you. Video is a key component in demonstrating observable skills. Also, maybe your IT guy already had you try a different browser, but try Chrome or Firefox and see if you still get the same error when you submit.
Hoping a different browser is the key,
Cheers - Shar ⭐