Oh shoot, great, that should do it for now and is definitely eisier than setting out the nextcloud. Though I hope we will get our own nextcloud server somewhere down the line.
Thanks

If you want to make your NextCloud available to the internet it’s pretty easy (and very reliable) to do so with cloudflare tunnels.

I had Setup nextcloud for this scenario for two weddings now - share a folder, create a QR code for the URL and print that on flyers, cards, whatever is handed out to the guests. Folder is set to upload only, so it's much like a "just place your files here"-link. Add another share link with read/write permissions to the same folder if needed, create a second QR code and you're good to go :-)
Depending on what permissions the "guests" should have, keep in mind that person a could delete person B's photos (un-) intentionally, so I would go for read only access if you have like inexperienced or old users, that don't know technology so well.

I do run Nextcloud on my home server, and in an ideal world I would like to use it as I have sufficient disk space, even though my internet connection speet would be the bottleneck. The problem is, I am at the moment hidden behind a hell of a NAT maze and my server is simply not accessible from outside, even with VPN.
I have found out in the meantime, As you said, I found out as well, Nextcloud permit uploading without need for signing up. I am now thinking about setting up an acount at some Nextcloud provider, but they seem to by limited by capacity...

I thought of google drive as well, even if I had to pay for expanding the capacity. Unfortunately it requires signing up to permit upload, download is permited to everyone with the link though.