Increase list attachment size limit

For document library, to increase the maximum upload size, the following change should be sufficient:

Central Admin > Application Management > Web Application General Settings, select the web application, set the Maximum Upload Size to the new value then hit OK.

In order to upload attachment with size greater than 50 MB, in addition to changes above, we also need to modify the web.config file. In the web.config file, replace with

There are other factors to consider when adjusting the maximum upload size, such as disk space, site quota, execution timeout, etc.