I have a new moodle site hosted in blue host (shared hosting). Initially I was able to add files (pictures, pdf) to the front page and to courses. Some weeks later though, I couldn't. When I click the 'Add an activity or resource' link and select a file to upload, for example, the file picker keeps loading infinitely as shown in the figure below.
I have searched several forum posts for a solution but not successful so far. The host says 'this is a moodle issue'. I am stuck here. Your help is most appreciated