Unable to upload images/files to Rise


I am attempting to add images or files (pdf) to my Rise course and I keep receiving an error message "There was an issue uploading. Please try again".  This is not specific to any one image and my colleagues have the same issue on their PC today. I am using FireFox as a browser. Last week everithing was well, but now I can't finish the project for my company. Would you please help to solve it? 

Thank you.

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