@chubners ufff... this might sound harsh, but I don't see the flow as a storage of important information.
It totally feels as something which allows you to temporarily transfer stuff from one device to another. Maybe it's just me who feels that way because I'm a web developer. I also remove all messages from the flow regularly to keep it clean.
I know you where not expecting to loose this information and this sucks. Seeing this service as a save place to store important things was a little naive, though
Another thing: When you deleted your flow, didn't you see the message which states that everything will be gone?
@SonicWeaver Step by Step? There is only one way. Also on the mobile phone, it's easy to find at "My Flow" -> Burger Menu on top right -> Settings -> Delete My Flow