All you want to know about Waffle and File Uploads
summary
Library is elixir-waffle/waffle (≈700 stars, millions of downloads) and it validates transforms and stores files as a DB string (filename+timestamp) when the record saves. Supports binaries, paths and URLs, integrates with Ecto via waffle_ecto, and ships S3 and local adapters while community adapters cover GCP/Azure. Validation can use magic bytes validation (calls file plus mime), transformations run via ImageMagick transformations or custom functions, adapters implement put/delete/url, and path needs the DB ID so use a transaction.
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