ACROSS events make use of the "Occultation Portal" just as does LuckyStar. So, I already have a presence on that portal from reports on Titan, Pluto, Eurybates... So at this point, just go to this website
and use your login / pw and it'll take you to your place in their site, and it'll show a calendar of events. You have to be reporting an event for which they have an entry in their own predictions. Find that event on the displayed calendar, and click on it, and the fill in the form that appears for that event.
You'll need to create a new "observatory or site" for each and every different site you use. So you click the "+" Icon and add your new site. Then fill in the rest. It seems you only can add one data file on the first page, which I typically choose as the IOTA report form. But on the second page which it will take you to, you can add as many files as you want. The raw data .avi file of course, but also the PyMovie .csv file you'll want.
On Page1 in the comments section, be sure to add a link to your own webpage so they can understand the context.
If you know you'll be reporting to LuckyStar or ACROSS, you might anticipate and take a dark field right after your image. Just a few seconds of video should be good enough, from which they (I hope) should take a median and apply that to all frames. A flat-field is also good, but that should be relatively stable for some time so e.g. for '22 we may just be able to use the flat field video we made for Titan (assuming the optical train was identical, and that includes w/ or w/o the dew shield).