How to save a PDF as a read only file?

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Our company saves its monthly employee schedules as PDF's. 

There are frequent changes to the schedules, so almost daily, a revised PDF of the schedule needs to be saved over top of the current PDF, in company netword folder that all employees have access to.

The issue being experienced is that if one or more people have a copy of the PDF open on their computers, then when the administrator of the schedule tries to save a PDF (i.e. "2021-04.pdf"), an error will be encountered indicating that the file is open and Adobe cannot currently save the file.

The files are being saved via Acrobat standard, with permissions enabled, as I thought this would mean that people accessing the file would only be getting a read-only file and would not prevent the administrtor of the schedule to save a copy over top of the existing file.

Is there any way to ensure that users on the network only open a read-only file copy, which would allow administrators of the schedule to save a newer copy of a PDF, regardless of how many people may be viewing the existing PDF?

[try67]

This is something you need to do at the folder and file level. Set their permissions to read-only. It's not possible in Acrobat itself.