Substituted PNG Files Not Displaying

[ChrisWard]

@foetusmachine

Can you think of another reason why only the "downloaded" files were being displayed and not the ones I was simply copying from assets to ASD?

Yes - the make-up of the paths. A URL can include characters that an Android path should not. I think you are currently "getting away with it" but any slight change to Android/App Inventor could break that.

@foetusmachine

Each file has a filename associated with it.

@foetusmachine

When I tried to retrieve each file to display, the system couldn't find the file, so it used the next best thing - an asset file that I had downloaded during the session.

I think that is unlikely but I see where your idea comes from. An easy way to prove it would be to give the 'assets' files a completely different and conspicuous image but using an identical filename to the downloaded ones. Note that a difference in file size does not matter at all.