Can We Use FreeRTOS OTA Library for Custom OTA Jobs?

Thank you!

The firmware is downloading now.
But I have one more doubt:

The .bin file size before uploading to the S3 bucket was around 10 KB, but when I check it in S3, it’s somehow only 6 KB. Even when I download it back from S3, it’s still 6 KB.

Is it being compressed automatically?