A thumbnail serves as a preview image for your content. It can display the document itself or another image. You can use images in JPG, PNG, or GIF format. For optimal performance, use images and GIFs smaller than 5MB.
Click here to access RELAYTO Best Performance Guide.
Step 1
Click "Settings" button in the top right corner.
![](https://cdn.relayto.com/images_originals/5QbSkYQ3RraBSfCUUKGA_Slide%2016_9%20-%20251%20(4).png)
Step 2
Click "Details" button.
![](https://cdn.relayto.com/images_originals/GOY0KqHSz20GsLtpzrcp_Slide 16_9 - 251 (78).png)
Step 3
Click "Cover image" upload icon and choose the image or GIF you want.
![](https://cdn.relayto.com/images_originals/5ossgY2gRoO5iglH9245_Slide 16_9 - 251 (80).png)
Bonus
Another way to upload a cover image is by clicking Share button on top right corner.
![](https://cdn.relayto.com/images_originals/ifPOcnxTK6wLzuqcLRf9_Slide 16_9 - 251 (81).png)
Hover over the cover image for the upload button to appear.
![](https://cdn.relayto.com/images_originals/OzeaEpYUSbOhb9wSQs5O_Slide 16_9 - 251 (82).png)
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