After upload image crashed in dropbox

It looks like you're attempting to download a file from Dropbox and then re-upload that file to Dropbox, but it sounds the uploaded file isn't formatted properly or doesn't contain the expected data and so is not successfully displaying.

Dropbox doesn't apply any additional processing or encoding to uploads, so you should make sure you're just uploading the exact/correct bytes you want stored. I see you're using a third party library 'dropbox-v2-api' though. As that's not made by Dropbox, we unfortunately can't offer support for that. You'll need to refer to the documentation or support resources for that library for information on how to use that to perform such operations.