Every time I tried uploading, I got this message
That action could not be completed. Please try again, and if this occurs again please contact the system administrator and tell them how you got this message.
Someone please help.
Try clearing your browser cache, this has solved the for others in the past
Solved, thank you.
Just for anyone else who may encounter this problem.
How to clear cache for specific domain name in Chrome
F12 > Chrome Developer Tools > Application tab > Clear storage in left tree > Select the data items to clear, then click Clear site data.