postiz-file-upload
Today I learned that the docs in postiz are a bit behind, (fantastic docs btw, they are to the point, and cover almost all of what you need). The docs state that you need to include an R2 bucket to handle uploads. This issue shows that more work has been done, one of which is local storage. The compose file they use in the quick start has the required env variables to set this up. looking into my running instance I can see my images there.