Always getting "The icon must only use black and should contain an alpha channel."
- Dominant language
- Python
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Description
### Environment
SaaS (https://sentry.io/)
### Steps to Reproduce
1. Go to an internal integration ([example](https://shopee-d1.sentry.io/settings/developer-settings/kenrick-testing-integration-bc451a/))
2. Upload an image at Small Icon
3. Save Avatar
---
I tried several simple images too, but always failed. When I tried the previously successfully uploaded image from my other [internal integration](https://shopee-d1.sentry.io/settings/developer-settings/shopee-mattermost-alerts-0e5b48/), it also failed this time.
Some images tried:
 --> this was used at other integration but failed when used in a new integration
P.S. Those images are exported from Figma. Pretty sure it only contains black color & alpha channel.
### Expected Result
Image saved
### Actual Result
Failed with "The icon must only use black and
should contain an alpha channel."
### Product Area
Settings - Integrations
### Link
https://shopee-d1.sentry.io/settings/developer-settings/kenrick-testing-integration-bc451a/
### DSN
_No response_
### Version
_No response_
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Assessment
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