If the internet article you are trying to upload spans multiple pages and doesn't upload for you entirely, there are two workarounds to get your entire article into Actively Learn.
Convert the page to a mobile view
STEP 1: Scroll to the bottom of the article, and click mobile view
STEP 2: Upload the text into Actively Learn using the new mobile url
You should see the entire text when you open the new import.
Upload from the print URL
STEP 1: Select print on the article page
STEP 2: Upload the text into Actively Learn using the new print view url
You should see the entire text when you open the new import.