Hi
@ArMor72
You're welcome, and thanks for the clarification. You are not alone in preferring ACR over Lightroom's Develop Module.
Could you provide the specific way,when you were in Lightroom, the command, process, or steps to open the file directly in ACR.
I do know that if you use Show in Finder (or Explorer, I assume for Windows machines), you can right-click on the file name and choose the app you want to use to open the file.
Yet you may use another approach from within LR, which I may be unfamiliar with. I also assume you are opening a raw file and not a JPEG, TIF, or PSD file into Photoshop (that requires other setting changes)
Debugging your issue requires getting down to details to get it figured out.
In any of the above cases, it is imported in the LR catalog settings that you have the Metadata auto-exported to an XMP file. Also, upon return to Lightroom, if you have metadata stored in the Catalog, you need to update the metadata to your catalog.
I bet we can figure out your problem bit by bit with the specifics.
John Wheeler