It seems strange that user-modified XML files are not supported seeing that the Web Presenter HD Installation and Operation Manual (April 2021) has a section for Developers where is states, I wonder if this includes streaming platforms that are not pre-installed on the Web Presenter HD, like Castr? (Step 2 - ) Any user-modified XML files are not supported. So it would seem that the only streaming platforms supported by Blackmagic for their Web Presenter HD are those that ship with the installed/updated Web Presenter HD firmware, those XML files generated by the ATEM Streaming Bridge, or the Streaming.xml file that ships with the ATEM Switchers Update. So, if you're using the Web Presenter HD on location and the internet speed cannot support an upload speed of 3Mbps and you modify the Blackmagic's supplied Streaming.xml file (supplied with the ATEM Switchers Update download) so that it streamed to YouTube at 2.5Mbps at 720p (which is still within the YouTube recommend bit rate for 720p video) and you had issues, then ' as you are modifying the XML would not support the use of the modified XML.' I do not know if this includes the Web Presenter 4K. This comment is from Blackmagic Design EMEA regarding the Blackmagic Web Presenter HD.

I'd thought I'd let those of you who have purchased, or are thinking about purchasing, a Blackmagic Web Presenter HD know that, ' for now at least do not support the use of user-modified XML Files'.

Blackmagic web presenter 4k