I have close to 8000 vcf files in a directory on the usb stick. I attach the stick to my phone and all files are perfectly visible. In the contacts app I choose import, select the stick, and it shows me all the contacts, so I choose "import all".
Unfortunately only first few dozens get imported.
Apparently Android v4 had the same problem as the following question explains: Transfer and import .VCF Contacts
It seems to me unlikely that so obvious contact app error remains unfixed for years.
How to make the contact app import all of them?
Please note that some of the contacts (actually quite few of them) are fairly complex with a lot of data - such as for example multiple, long "note" fields, multiple phone numbers with different attributes, sometimes custom-defined, very long company name fields, multiple addresses (private / business / branch office list, etc.) and so on.