JavaCard OS

I downloaded a file to a card and this file is not an applet, but it's used by another applet. Then I checked the APDUs log. The Descriptor.cap has not been sent to the card. In my opinion, it should also been sent to the card, am I right?

Is there any error information in the log when downloading the CAP to the card?

The descriptor component is defined as being optional. No components in the CAP file reference the Descriptor Component. It can be used to parse and validate the elements of a CAP file.