I’m relatively new to using URL schemes and I can’t seem to understand what I’m doing wrong. I’m trying to append a draft to an existing sheet in Ulysses using the insert scheme. Can someone help me understand what I need to fix and why. Screenshots follow.!Thanks for the help in advance 
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General structure looks like the one in the Ulysses web site examples.
Is that ID definitely valid? 
How can I validate that it is indeed valid? I used the Ulysses app to get the id from the share menu.
I don’t use Ulysses, but that should be fine.
If you copy and paste the URL into Safari’s address bar, what happens there?
If it fails there then there is something wrong with the URL, and I would try substituting in a single word as the text to append and testing that from Safari too. Then if that fails, with a different ID.
If the first Safari test works, then that indicates the issue is on the Drafts side. In that case, please share your action. There is an option to do this (unlisted) utilising the Action Directory.
Somehow when I re-copies the URL, it ended up working just fine. Thanks for the tip on using Safari to test out the URL.