Hi @Vero,
All good about going off-topic. I didn't realize there was no off-topic section of the forum. I should have checked for that first.
By default, it will paste to the iOS clipboard in the simulator. Then you can paste from iOS to paste the content. If you enable the setting to send menu keyboard shortcuts to the device, you can paste directly to the device; however, that doesn't make Alfred snippets start working, unfortunately. It also makes the simulator pretty unusable as a develop because I'd lose all my keyboard shortcuts.
I tried slowing down the key events all the way, with and without that setting enabled, but had no luck.
That I'm sure I haven't done. It's cmd + v for me.
I think that's true, it's a limitation of the simulator that when you paste from macOS it goes to the iOS clipboard but does send a paste iOS event. That being said, I think Alfred could work around this by sending key events of the snippet contents (1 character at a time, quickly) to Simulator (this would only be needed for Simulator). It wouldn't be as fast as pasting, but it should work in theory.
I know this is a pretty rough edge-case, but with Alfred being a power user tool, I think a lot of iOS devs use it and would appreciate this feature. Right now all we have is text replacement, and that is not shared across simulators, of which we deal with _many_. Being able to use Alfred snippets in Simulator would be a major productivity boost for things like filling out forms.