Feature Request: Add Image caching for when ecto changesets are invalid

[Deleted user]

Given I'm filling out a form for a model
When I'v selected an image
And I have some other attributes that will cause the changeset to be invalid
When I submit the form and it re-renders the edit view
Then I would like it if I didn't have to reselect the image and the previous selection was still set.

An example of how a simular ruby project carrierwave does this can be found here.
https://github.com/carrierwaveuploader/carrierwave#making-uploads-work-across-form-redisplays

[abitdodgy]

Ruby's Refile does a fantastic job of this. It uses two buckets in AWS: cache and store. Initially, the file is saved to the cache bucket on form submission. If the form submission succeeds, the file is copied from the cache to the store bucket; otherwise, the cache will auto-expire and delete the file.