If your switch is running Native IOS you have to use sup-bootflash to access the bootflash of the supervisor. If you just say bootflash you will access the bootflash of msfc so to access bootflash of supervisor you have to give command sup-bootflash:
Yes you can copy image from tftp server to sup-bootflash:
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...