I have also noticed that it is missing and I use this all the time. Garmin do something about it and bring it back.
no, it hasn't been just like this for many months. As reported the "import" feature being discussed in this thread disappeared just within the last several daysThat's true. The screenshots I posted in another thread on here shows that there was an Import link, next to +‑Manual‑Activity in the top right corner of the Activities page, as recently as 14‑February.
same here :(
There is also an option to click the + in the upper right corner and select import data. This FAQ offers recommendations for manually uploading files.