You can attach images to messages in spheres, though you may have noticed that certain images appear "cropped" or blurry.

The reason is simple: these images are previews, that you must click on in order to view the image in full resolution.

Why not display images directly in messages?

For two reasons:  

1. Some images do not lend themselves to being displayed in a stream of messages, for example the image below, which has a long, vertical format that takes up a great deal of space:

2. You can share as many images as you want in a message, which will then be displayed as a patchwork. This allows you to visualizee the whole, without taking up too much space.

What are the recommended dimensions?

Images are displayed in 611x390 px.
Therefore, you can share an image that has this proportion (1:56), for example: 1000x638 px 

or:

If you wish to display two images, different proportions are possible:

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