R26. Compress upload fields to a defined size

[paarals]

Is your feature request related to a problem? Please describe.

Describe the solution you'd like
As a platform operator, I would like the uploaded files (jpg, jpeg, png, pdf) to be automatically compressed to a defined size. Only if uploaded via frontend.

Mock up

Does this issue could impact on users private data?

Acceptance criteria

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Technical specifications

Implementation

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Testing

Additional context