hello, you can set this in Studio => Permission, but if you have 2 MB, this limit probably comes from your server, see the variables in your php.ini
post_max_size = 2M
upload_max_filesize = 2M

post_max_size is the limit of the entire body of the request, which could include multiple files. Given post_max_size = 20M and upload_max_filesize = 6M you could upload up to 3 files of 6M each.