Maybe helpful for someone:
I you mostly Linux, though sometimes I have to use Windows for work. I had some problems with sharing files on a partition, somehow Windows tries to be smart and keeps log of the files there, so sometimes files were not showing up that I copied over from Linux.
I tried different filesystems, even with fat30 I had problems.
I ended up buying a MicroSD card that is now always in the slot and serves as file sharing medium between the operating systems. Works very well and also gives me additional storage.
Yup. Anyone running Windows is using it, by default, already.
Well, unless youāre running something ancient like Win98ā¦ 
Most distros have ntfs-3g as a package, which is the most common NTFS driver for Linux. Iām not sure what the best way for a user to map it in the GUI is, Iāve manually mapped the drive using fstab for over a decadeā¦
At least for those using Ubuntu or another Debian derivative, MountingWindowsPartitions - Community Help Wiki should be a decent starting point.
On modern machines youāll want to disable the fast restart option in Windows because that does something to NTFS drives to make Linux unable to read them.
I second @AndreLehner and @betazoid in that having a secondary data drive is a better route to take. Then you can format it exFAT or something thatās easily read everywhere.
Probably the gold standard is to run a NAS and host your data on that. Things like QNAP and Synology boxes are pretty easy for even regular people these days. Problem is buying hard drives right now.
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i have dual boot windows 10 and kubuntu. i disabled fast startup on windows and then my drives with images one (on is the windows drive, the other and old hd ) are always present and i can edit in darktable on either OS and then synch the database either way
Thank you ALL - very much.
This is a lot of new information, and I need time to digest it all.
Iāll be back if I need further.
Good point, Iād forgotten about that one. Yeah, that one IS important nowadays.
itās because Windows leaves the drives mounted (or doesnāt unmount them) when closing down. it usually works in linux if you mount them but often you can only read from the windos drives then and not write to them