I've spent at least 30 minutes searching the forum and now given up and joined the forum to ask folks for help here.
I've downloaded a journal article that comes as a .dms file. If I decompress it, Calibre's reader will open the OPF file so I can read it on my computer. So it worked and the information seems to be there.
But I can't figure out how to add it to Calibre so I can send it to my Kindle. (up to date Calibre on Mac Catalina)
I've tried a bit blindly a few things. Add OPF. Add DMS. Uncompress dms, zip entire folder and add zip. Zip just the OPF file...
The link to the download is here that leads to a compressed dms file
https://conflictandhealth.biomedcent...031-020-0257-2
Grateful for advice.
And while I'm here - add my thanks to the creator of Calibre and I presume a bunch of contributors that support it. It's fantastic.