I'm a complete beginner sorry but I think I have managed to add the catch which is showing two errors:
{"topic":"","payload":"","_msgid":"bc276840.11d028","filename":"speedtestData.json","error":{"message":"Unexpected end of JSON input","source":{"id":"63a0c3bd.82248c","type":"json","count":1}}}
2nd message:
{"topic":"","payload":"","_msgid":"bc276840.11d028","filename":"speedtestDataPD.json","error":{"message":"Unexpected end of JSON input","source":{"id":"330c9ca3.cd2e44","type":"json","count":1}}}
I've not changed any filename paths (will have to look up how to do that if i need to)
the "restore" inject is set to operate at start up & as the first time you download this flow, the files wont exist - you will get an error.
Add to that, I suspect this flow is quite old (it refers to old dashboard...
... and may require some tweaking to work with new node-red and new dashboard