Upload files to disk with `st.file_uploader`

[jrieke]

Checklist

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Summary

Add a way for st.file_uploader to upload files directly to disk. This should not store the file in memory.

Why?

This is great for large files that don't fit into memory. An alternative is uploading them to S3 or some other external file storage (see #10827).

How?

Maybe add a parameter destination="memory"|"disk". Or we could (additionally?) have a config option that sets the location for all file uploaders. If "disk" is set, st.file_uploader should return the file path of the uploaded file instead of an UploadedFile object.

Additional Context

No response

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[Agent-Hellboy]

Hi, I would like to work on this, as I am using Streamlit for one of my tasks and it could help me explore the codebase.

[amanchaudhary-95]

Please add a default parameter that will set default files from disk. E.g. file1.txt, file2.jpeg as default uploaded files from the disk as the st.file_uploader widget initiates.

[jrieke]

@Agent-Hellboy We want to make some bigger changes to our server framework over the next few months, which will be a prerequisite for working on this issue. Will update here once that's done.

[jrieke]

@amanchaudhary-95 I created a separate issue for this in #10849.