for Chrome: log into IG as usual. Then click the three dots on the right-hand side (the "customize and control Google Chrome" button). Click MORE TOOLS and then DEVELOPER TOOLS. The page will now show the developer tools along the right side of your screen. Ignore that stuff lol. This is the important trick: DRAG AND DROP a lo onto IG's screen. [It should appear on a black background.] Then hit the BACK button. Now you should see the buttons available to you on your phone, like the Home button and the ADD button (the plus sign). Click the Add button and upload your page.
After you do it once, it'll be easy, I swear lol. I like to post my pages all at once, so using Later or another app/extension just doesn't work for me, but I know lots of people love it. Hopefully you find something that works for you!
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