Hi @Georgia_Peach welcome to the community.
Just checking the basics with you first
So below is an extract from the glide documentation, have you seen and read this?
The easiest way to host images is by uploading to Glide. You can upload images in an Image Column in the Data Editor, or you can drag images onto list items.
External hosting
We reccomend hosting your images with Glide. However, if your app only uses a few images (10 - 20) you can use an external service like Dropbox, Google Drive or Imgur. All you need is a shareable link to your online image that is public, so anyone can view it with the link.
Two of the easiest ways to host your own files online are with Google Drive & Dropbox.
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In Google drive, upload an image, right-click on it, then click Get sharable link and make sure that Anyone with the link can view.
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In Dropbox, upload an image, click share file, make sure the link settings are set to Anyone with the link can view and then copy the link.
Now you can connect the column with your image links to the Image property in Glide.
The full link to the page is here.