Willem-Jan,

find the site packages in RPI4 with
python3 -m site

check if indiweb is in

change to indiweb dir

open main.py there

change line
BaseRequest.MEMFILE_MAX = 100 * 1024 * 1024

to
BaseRequest.MEMFILE_MAX = 1000 * 1024 * 1024

manually and restart indiweb. Hop this helps.
Michel

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