I asked them elsewhere in the thread and Connect doesn't have crossposting either, fwiw. I have no idea why they're posting in this thread, their answer has nothing to do with your question.
I have both Connect and Jerboa installed, they're both fine. Connect looks prettier, and the search is definitely better. I end up using Jerboa more out of the two.
When I want to cross-post from mobile I end up switching over to Lemmy's mobile web interface, which can be saved to your home screen as a progressive web app. Not a Jerboa-native solution, but I've tried a lot of the Android apps and I haven't seen any of them support a proper cross-post.
Sorry, I don't see the option. But, very easy drop menu to copy Lemmy URL or imbedded article URL. So, kinda easy enough to use for a new post in which ever group you were planning to cross post.
Not a huge fan of cross posting. I'd rather not see the same exact image three times back to back in my subscribed feed from the pics, aww, & dogs communities of someone's fur-baby. If Lemmy ever adds cross-posting there should also be a Detect Duplicates option.