Hi @Byra_Tusj and sorry for the hassle with this.
While dropping an image onto the canvas won't work here (because it is a browser-based version), you should be able to add an image from the import menu and from the plus sign in the image properties.
Just a side note here: Importing an image from the Import menu won't place the image directly on the canvas, it will simply import the asset in your project. The image will be available from the UI Library and from the Quick Add tool.
If the issue persists on your end, could you please reach out directly via firstname.lastname@example.org and send us the related image file so we can try to reproduce it here?
Sorry again for the snag, we'll do our best to help!