@MichelleAngeli ...
It could be that you have exceeded your personal file storage. Try this... In Canvas, click on the "Account" button on the far left-hand side global navigation menu. Then, when the slide-out menu appears, click on "Files". This is your personal "Files" area where you can store files. Look at the bottom left of your "Files" screen. You should see a percentage bar. What does this percentage show? If it's at or near 100%, and you are trying to upload a large image (in file size), you may not be able to upload the file. You'd have to delete some other files first in order to upload that file to your discussion post.
Please let us know if you have any other questions about this...thanks!
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