Stacks4Stacks offers the free Droplet 2 Upload stack. For some of my projects, I needed a couple of modifications, so I added the following features:
Check out also the original documentation.
The included demo places four Droplets on a single page. You can upload up to four images. If an images was already uploaded, it's displayed and the corresponding droplet for this slot is not shown. The demo makes use of the Condition stack to check if a images was already uploaded.
DemoPlease note: Beside some stacks i've written by myself, I also offer downloads of modifications of existing free stacks (aka "extended versions"). The credits for this stacks go to the initial author. It is possible (and very likely) that my modifications might break existing functionality. DO NOT CONTACT THE ORIGINAL DEVELOPER AND ASK FOR SUPPORT!
If something is not working as expected, I recommend to remove my version and install the original stack to validate if there's an issue with the original stack and then either contact me (if it's likely that my modification is the issue) or get in touch with the developer of the original stack.