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IPv6 Proxies can be created now only with VULTR (maybe Alibaba) and or any provider via Merchant Tools since all Merchant Tools contain now IPv6 generator. To be able to create IPv6 Proxies you need to get IPv6 Address with prefix thanks to CreateProxy may generete any number of IPv6 Proxies.
Please note, even you have IPv6 Proxies you are connecting to them through IPv4 IP Address, because CreateProxy will make you Ports where these IPv6 Addresses are connected to.
To your Instagram question: I can not tell what is working where here on CreateProxy is 10 providers + Merchant Tools that can do the job as well on any VPS/Cloud.
So Im sure you will find way how to do what you need in here.
Yeah, I know it will make me Ports. But when I connecting to 1 IPv6 does it show my IPv4 or not? Thanks.
I check it like that: https://imgur.com/ptbCkE9