You can use any third-party app for collage that are available in your play store or apple store such as Mojo or adobe spark post and such app. Mojo is known as a library of templates for story and collage-making. You can always pair the image with text and graphics or stickers. To customise pre-loaded designs, adjust the timing and components as needed. The third-party app has a lot of exciting features such as a grid in which you can easily make a scrapbook and gift it to someone on their special occasion. So you can also make instagram collage from a third-party app.