Upload up to 20 MB files
Upload up to 20 MB files

Improvement for https://github.com/JamborJan/paperwork/issues/17

100MB makes no sense.
Tests show that 10MB files work best so far.
Import is still experiemntal and fails often.
Improvement must be done upstream.

See: https://github.com/twostairs/paperwork/issues/13

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