The importer will then fetch a list of your Tumblr blogs and let you pick which one to import. Click Import this blog to get going.
If your Tumblr site has a custom domain (like you.com instead of you.tumblr.com), then you’ll need to disable the custom domain temporarily while the import is processed. You can do this by going to your Tumblr Dashboard, clicking on the Settings button and then un-ticking the “Use a Custom Domain” checkbox:
Once you start the import, progress will be shown on the import page and you’ll receive an email when the import is finished.
We try super hard to make sure that all your Tumblr content, including your videos, are imported into your WordPress.com blog. Videos you had uploaded to Tumblr are imported into VideoPress and other embeds are converted to use shortcodes. Sometimes the importer finds an embed it can’t convert and a list of these is included in the import completion email for you to check.