A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Dear Dorothy,
The AutoCAD Web App has been integrated into SharePoint Online. So your requirements seem to have been achieved in SharePoint Online. You can view and edit the .dwg files in AutoCAD Web App directly in SharePoint Online. However, you may need to have an active AutoCAD LT subscription to edit them online.
For your reference: Announcing new integrations with Autodesk AutoCAD for Microsoft OneDrive and SharePoint
Regarding the issue “This icon seems to have now disappeared from SharePoint.”, could you upload some related screenshots?
Note: Remove any private information before uploading the screenshots.
Do you see the Open option>AutoCAD(web app) when you select the files? The AutoCAD Web App may need to be opened with the latest versions of the Chrome and Firefox browsers.
Best Regards,
Cliff