refreshed a few more times and now it gives:
{"message":"Server Error","code":500,"type":"general_unknown","version":"1.8.0"}
appwrite logs:
2025-10-26T14:08:56.686327017Z [Error] Timestamp: 2025-10-26T14:08:56+00:00
2025-10-26T14:08:56.686356177Z [Error] Method: GET
2025-10-26T14:08:56.686359777Z [Error] URL: /v1/storage/buckets/:bucketId/files/:fileId/preview
2025-10-26T14:08:56.686362497Z [Error] Type: Exception
2025-10-26T14:08:56.686364737Z [Error] Message: Image conversion failed
2025-10-26T14:08:56.686367137Z [Error] File: /usr/src/code/vendor/utopia-php/image/src/Image/Image.php
2025-10-26T14:08:56.686369457Z [Error] Line: 489```
could be a problem with webp in 1.8.0
