Mendeley import didn't attach all pdfs
I completed a local Mendely import, but Zotero didn't attach the pdfs for some 100 references, even though I had them locally.
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Upgrade Storage
(Zotero tracks file paths and makes them available via syncing in a much more reliable way. It's quite common for new Mendeley installations to lose links to files for this same reason.)
A Mendeley Desktop 1.18 database? We'd probably need to see a copy of the .sqlite file to tell you more. If you don't mind sharing it, you can ZIP it and send it (or a link to it) to support@zotero.org with a link to this thread.
But it'd be better to debug the problems you were having with the online importer. The local option isn't even shown in the import dialog anymore.
I deleted all Mendeley traces (good riddance), but I can go at it again tomorrow.