When the submit assignment button is pressed, loading popup appears and will not load the upload box on the screen. Any ideas?

When the submit assignment button is pressed, loading popup appears and will not load the upload box on the screen. Any ideas?
Hi Emily,
Thank you for reaching out in the Schoology Community!
Can you confirm you are using one of our supported file types when uploading attachments?
If so, have you reviewed our System Requirements Guidelines to ensure optimal performance while using Schoology?
If the issue continues to persist, please let me know. I will be happy to take a closer look.
Best,
Nina Lewis
Community Communications Specialist
Schoology | A PowerSchool Unified Classroom Product