I am currently using Mautic 3.0.0 with PHP 7.3.20.
I tried importing a CSV file from my local computer to Mautic. I uploaded the file and I chose , as a delimiter, " as an enclosure, \ as an escape and 100 as a limit (the default import settings). I was then redirected to the next step without any issues and because the file’s header column matches Mautic’s custom fields’ aliases, I just clicked on “Import”. I was then redirected to Mautic’s import history page and the import’s status was “Queued”.
The problem is that even after several hours, the progress is still 0% (0 rows inserted, updated or ignored). I thought that the reason was the slow connection or the file’s volume, but trying to import a much smaller file gave the same result.
Have you make sure that you add mautic:import command to the cron jobs? please check https://docs.mautic.org/en/contacts/import-contacts#background-import for the import command cron jobs configuration.
You can also read other mautic cron jobs configuration in here: https://docs.mautic.org/en/setup/cron-jobs