Adding to Ann and Hector’s advice,
What computer and operating system are you using?
Sometimes, depending on how your PC reboots and if you have added other external devices, it could be something as simple as a swap-around on the drive letters in the root file system.
Not sure if Mac has similar issues.
If on Windows, and you haven’t already done it, I would suggest that you map your drive.
Here is advice from Microsoft on how to do it:
Map a network drive to get to it from File Explorer in Windows without having to look for it or type its network address each time.
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Open File Explorer from the taskbar or the Start menu, or press the Windows logo key + E.
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Select This PC from the left pane. Then, on the Computer tab, select Map network drive.
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In the Drive list, select a drive letter. (Any available letter will do.)
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In the Folder box, type the path of the folder or computer, or select Browse to find the folder or computer. To connect every time you sign in to your PC, select Reconnect at sign-in.
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Select Finish.
Note: If you can’t connect to a network drive or folder, the computer you’re trying to connect to might be turned off, or you might not have the correct permissions. Try contacting your network administrator.
https://support.microsoft.com/en-us/windows/map-a-network-drive-in-windows-29ce55d1-34e3-a7e2-4801-131475f9557d
My laptop has a small main drive for the work that I do, and I often have to use external SSD drives. It is rare that I have to re-link everything, unless I have trashed the preferences or done other fun stuff in the background.
Atb
Mads