Thank you for your reply Androu.
I used both imported and from the photos app so I’m not sure where these particular files were from... however I started to import the files again and I noticed that if i dropped any part of the source material onto the unlinked clip I got the option to ”replace missing material”. When I did this it automatically was edited like before! I just had to copy paste the attributes and do the odd speed change manually. While it still took a. It of work, my misstake only took 1 hour to repair instead of 4-6 so I’m happy
I made sure to backup the project to my network drive this time
I realise IOS gives files different identifiers when reloaded to the device but it would be great if there was some way to point at a source where LF can find the source and then automatically update all clips that use that source.