curl --location --request POST '/api/channels//avatar/upload-url' \
--header 'Accept-Language;' \
--header 'Content-Type: application/json' \
--data-raw '{
"fileType": "image/jpeg",
"fileName": "avatar.jpg"
}'{
"uploadUrl": "https://s3.storage.ru/...",
"key": "channels/550e8400.../avatar.jpg",
"expiresIn": 3600
}