I gave up after spending hours with Amaysim / Optus help desks, who wanted to reset APN settings etc. All to no avail. Purchased a Telstra Sim and ported account over from Amaysim.MMS works with Telstra.
Hi.I have put a boost mobile sim in phone and was able to send receive photos with asus. Put amaysim Optus sim in my samsung s21 and had same issues. Must be in APN settings. Amaysim have not been able to resolve settings.