When creating a bundle Preset, datasource references are included in the preset, but not the datasource files themselves.
it would be great it that files could be also added to the bundle Vmix create.

or local network that can be different when setup on diff event location

In that cas, Vmix should be ok by changing the path to the file when loading the preset bundle.

For example :
in my source preset, file was on f:\myfiles\datasource.xlsx

I want to save my preset as a bundle : Vmix save that datasource file in the preset

When loading the preset, vmix reference the datasource files (other than url defined files) as local to the bundle, or could propose to store that file somewhere where the computer has access.