[solved] updating header image fails with 403 error

hi good morning folks - i have a question regarding the header image of our local ttn-community page … i tried to upload a new jpg. image but this fails with 403 error. is there a special size needed for the image ? or is it limited in kB upload size ? my local browser is latest firefox – thanks in advance for your help !

Forbidden (403)

CSRF verification failed. Request aborted.

More information is available with DEBUG=True.

my way is the following:
our story - edit
update header image

status update: with EDGE i got the 413 error

413 Request Entity Too Large

now its clear for me - the jpg. was to large - i reduced size to 1024 AND 500 kB file size ---- upload was then fine with EDGE browser

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