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Steps to reproduce
create note on windows and iOs app
Expected result
Because I had created the note on windows first I expected to be able to link a text that I had already typed on the iOs app to the same note.
Actual result
However, because the iOs apostrophe seems to be different it created a separate note
The iOS keyboard uses typographical single or double quotes by default, whereas Windows uses the straight ones (what you type on your keyboard are the non-typographical ones). That’s not an Obsidian bug.
You can either change that on iOS (I don’t know whether it’s possible), or install the smart typography plugin which will turn the standard quotes into the typographical ones.