I have seen the official meaning: "A circle with a green border and a green checkmark means that a file was opened (directly or with a third-party application) and synced,"
but what does that mean in contrast to: "A solid green circle with a white checkmark means your file is synced and available offline"?
If I want a set of files to be both available online and offline, shouldn't that result in a solid green icon? Why are most "A circle with a green border and a green checkmark" and only a couple solid green? I thought maybe it had to do with opening the file on the same device or perhaps opening it on another device, but it made no difference to which files are assigned a solid green background versus white. I'm very confused.