upload files

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I use c5 version 5.2.1 and I' m trying to upload a pdf file (11 mb)but I received the message "invalid form token"
what's is wrong?

 
frz replied on at Permalink Reply
frz
do smaller files work?
do files of similar size but other types work?
can you upload any files?
ioannispad replied on at Permalink Reply
yes, I can upload smaller files (pdf, images, ppt). Also, files of similar sizes don't upload.
ScottC replied on at Permalink Reply
ScottC
max_upload_size and max_post_size are usually defaulted to 2mb on most instances. These values need to be upped. At least that is where I would start to look.
mcr replied on at Permalink Reply
I'm very new to php.

Where would I find the 'max_upload_size' and 'max_post_size' and how would I change it to increase the file size for upload?

Thank you,