If you need to use Dropbox for bulk uploads(which is not as easy as other options) it will work. You will just need to do an extra step that the others don't. Simply create a spreadsheet in your dropbox folder and copy the image links to it. Then you can upload that spreadsheet with the bulk upload.
However, I recommend a different file sharing service, or even better a photo sharing service, here is a list of suggestions
My preferred choice is Imgur
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