Thank you for reaching out, and we're sorry you have issues with your schoolwork.
Do you see an error message? If so, please share a screenshot. Is the same happening with another file? Can you precise the type of file it is? A video or picture? We've got a few ways of doing this that could help:
Try editing from another browser, such as Microsoft Edge, Safari or Chrome
Test in incognito or privacy mode. Here are instructions for Chrome
Clearing the cache/cookies from the browser may help
If the issues persist, please send a screenshot or a screen record so we can see what you're experiencing.