I am unable to drag blocks of code to the viewer. I have tested my mouse, the mouse pad, restarted MIT APP Inventor, and restarted my computer. Any suggestions?
From where ? By "viewer" do you mean Blocks Editor ?
I hope you did not edit the blocks in a Paint program, or get them from a screenshot.
https://ai2.appinventor.mit.edu/reference/other/download-pngs.html
P.S. These blocks can be dragged directly into your Blocks Editor workspace.
