It's important to understand how cloud storage works. Because otherwise you might lose your data.
Cloud storage means that your data is stored ONCE on some server somewhere on the internet. It is almost certainly a partially redundant RAID drive. Which means your data is
fairly safe. But it isn't
absolutely safe. It can go wrong. Neither google, nor any other cloud provider offer absolute guarantees (unless you pay a fortune). As Redmire's link indicates. So you do need to think about backing it up somewhere.
There are several ways you can access this data. I can think of one more than uspaul, the extra one being what you actually asked for (though not necessarily what you
need )
1) You can login to the google server on a browser and view your pictures. VIEW the cloud data
2) You can login to google server on a browser and manually download your pictures to your PC. Manually CREATE a copy.
OR You can install Google drive on your PC. This has 2 effects:
3) It allows you to automatically synchronise a folder on your PC with the Cloud version. Automatically CREATE a copy.
4)
It will create "Google Drive" device on your PC which allows you to VIEW the Cloud data directly in File Explorer on your PC. Although the data appears to be on your PC. What you are actually looking at here is not a copy, but a doorway directly into the cloud storage.See "using google drive on your desktop"
here(Note for others: Dropbox, iCloud and OneDrive all offer the same options too)
Option 3 will use a lot of space on your PC disk. Precisely what you said you
didn't want. But you can turn it off in the GoogleDrive options, as my link explains.
Using option 4 will allow Paintshop or any other program to access and edit the data directly on the cloud. That's what you asked for. But it is important to realise that if you do this you are directly manipulating your ONE copy. If you muck it up, it's gone! If you delete it, it's gone!
I would suggest that before editing, you should ALWAYS create a copy somewhere. NEVER edit your original photos.
I also agree with the previous posters, that cloud storage is NOT sufficiently reliable to rely on for your precious photos. You need to CREATE a second copy somewhere. Either on your PC, or on a removable drive, or even a removable memory stick (they're huge these days).
Hope that helps,
Gryff