Upload or remove a custom chat background
Upload or remove a custom chat background in Cortex Chat: practical steps, setting explanations, result checks and troubleshooting.
Custom backgrounds accept PNG, JPEG or WebP up to 5 MB and fewer than 24 million pixels. The image is processed and stored locally rather than uploaded, and the interface says it is cleared when you sign out.
Before you start
Appearance, layout, notification sounds and some cached history are device/browser state. The interface explicitly marks a conversation background as This device and distinguishes an account-saved default Sidekick from a cached value. Another participant or device may therefore look different without anything being broken. A cached conversation is useful while reconnecting but does not prove that identity is currently verified or that a new message reached the server. Preserve useful drafts before clearing browser storage. When troubleshooting, distinguish browser permission, local preference, network availability and external service state instead of treating them as one setting.
Step-by-step
- Expand Chat background and choose Upload background.
- Select an appropriate non-sensitive image and review the resulting preview and save confirmation.
- Use Remove custom image when you no longer want it, then verify the selected preset.
What the settings mean
| Control or state | Meaning |
|---|---|
| Device preference | A setting whose effect is local to this browser or device. |
| Account preference | A value confirmed as saved to the signed-in account. |
| Cached history | Previously stored conversation content, not a new server result. |
| Browser permission | Microphone, sound or notification authority outside the app switch. |
Check the result
The intended local image is used only for the current conversation/device and can be removed.
If it does not work
A rejected image needs a supported format, smaller size or fewer pixels. Do not interpret the local preview as a shared group upload.
Continue with the right context
Return to the Cortex Chat guide index to choose another task. Keep the current account, assistant and conversation in view when following the next guide. To use the product, open Cortex Chat.
- Switch between light and dark mode
- Choose a conversation background
- Dock, pop out or minimise Sidekick chat
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