Page_attachments (attaching images and other files)

I have radiant installed, with rmagick and page_attachments is working
but it only works with very small text files. Is there any configuration
I can change to make it work with larger files? Has anyone else had
this problem?

Unless your hosting provider or web server has a limit on the POST
size, it should allow attachments up to 10MB in size. Could you give
some information about your hosting solution?