BI6OTI Compressing images easily results in a flower-like appearance. If using the server to convert formats, it consumes significant performance, and PHP is prone to crashing on low configurations. The server's capacity is also insufficient. Using the conversion provided by OSS also introduces new charges.
Therefore, after considering both options, storing images in OSS and using an internal proxy to avoid approximately 2/3 of the costs (OSS costs include storage fees, request fees, and traffic fees), is the better approach.