No way of signing a PDF document accessed by VPN

Hello,

As soon as one opens the VPN, one is disconnected from Adobe Acrobat. It's thus impossible to sign a PDF document using Adobe Acrobat if the document is on an external drive accessed by VPN, ie all our documents. This has been going on for months and is still not fixed by Adobe. Looking forward to learn how to overcome this bug using the VPN (please don't suggest to move our documents to our PC or to OneDrive, because company documents need to be on VPN connected drives and not on a cloud solution such as OneDrive and not on individual PCs. Thank you in advance.