Hi. I tried Photoshop in addition to my Lightroom CC as the only option how to merge photos from Lightroom CC. And it was a pain, I reduced my Adobe subscription back to Lightroom CC only in a day. Here is the thing:
1) I have like 21 panorama photos in Lightroom CC 2) I select those 21 photos, right click and... oh, 'Edit in Photoshop' is greyed out 3) I spend several minutes by opening those photos in Photoshop one by one 4) In Photoshop, I go to Automation, Photomerge 5) There I am said those photos must be saved first in order to use Photomerge (WTF they must be saved? They are saved since I have Lightroom set to store originals locally) 6) Searching how to save all 21 photos at once 7) Saving all opened photos one by one 8) Photomerging, finally 9) Wondering how to send great result back to Lightroom 10) Saving to desktop folder, then manually importing into Lightroom CC 11) Finding I have now 42 panorama photos, everything is duplicated 12) Manually deleting every second panorama picture 13) One panorama finished, moving to another.