The file upload widget allows a maximum of 100MB of file data to be uploaded during a single transaction. This limitation exists to eliminate the possibility of tying up large amounts of server resources due to users transferring excessive data.
If the 100MB limitation is insufficient, it can be increased by defining environment variable PUI_UPLOAD_CAP in the Apache server configuration. The size is given in megabytes; any size can be used.
For example, to increase the limitation to 200MB per transaction:
SetEnv PUI_UPLOAD_CAP 200