Our company use MS Sharepoint Online. When we open any pdf from mapped drive (WebDAV), file gets downloaded and then opened. But if we open next pdf file (Acrobat Reader DC PRO is open), file gets downloaded in background, then window shows up “Check out & Open, Open and Close ”. Whatever I choosed "Check out & Open" or "Open" , file starts download again and only then it opens. It happens with all next files.
Sorry for poor English
Sorry for the delay in response.
Would you let us know if you have installed the latest update and have tried reproducing the issue? I hope you already have found a solution to this issue.
If the issue is still reproducible, help us with the version of SharePoint, WebDav server and version of Reader installed. Also, the name and version of operating system you are using?
If you have found a solution to this issue, please update the thread with your findings.