Free encrypted file sharing for clients to send me sensitive information?

edited to simplify

clients need to send an intake and a swath of photographs. its nothing too important (ie, its not credit card, address, billing info), more, medical information can be there.

current pathway is to have clietn upload to a drive and share the link with me. the link sharing is secure (proton mail), at least from my end.

im wondering about a service like wormhole, or if nextcloud, sync, etc are secure enough. something like wormhole seems good, …

encrypted file sharing free information privacy send sharing