I was a big fan of bubble, but seriously the more you learn the more you find limitations, it is a very good tool for MVP but a horrible one for scaling 
this issue is one of the most stupid limitations
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Yeah this was one of the few things I gave up on and have now just left it so that the image replaces the upload button. So effectively the text ‘Upload an image’ only shows when there is no image, once an image have been uploaded I reply on users to ‘guess’ how to upload a new one!
I am sure there are ways to clear the data (remove image from the button) as described in this thread but this became lower priority for my app.