How to collect photos from a group without guest accounts
Separate contributing from viewing, make the invitation clear, and give everyone one simple place to add their files.

Decide whether you are collecting or sharing
Collecting files does not have to mean giving every contributor access to the entire collection. Dropbox’s file-request documentation explicitly supports contributions from people without Dropbox accounts. Its separate shared-link workflow handles viewing and downloading. This is a useful distinction when choosing a tool.
Make the instruction easy to follow
Choose a collection name everyone recognizes. Send one short message: “Add your photos here so everyone gets the full collection.” State any file-size and expiry limits before asking people to upload. Send reminders manually, when they are useful to the group.
In PicRove
The organizer signs in by email and creates a space. Open Space settings & invitations, create an upload invitation, and copy its link or download its QR code. Guests open the full link, choose supported files and keep their browser tab open while uploads finish. Upload-only links do not grant gallery access. Create a separate view or download invitation when the collection is ready.
Treat invitation links as keys
Anyone a link is forwarded to can use it. Google Photos documents the same general risk with link sharing and provides link-reset controls. In PicRove, revoke an invitation to invalidate guest sessions from that link. Downloads that already happened cannot be recalled.
Sources and further reading
Bring everyone’s photos together.
One private space, from any supported phone or browser.
Create a shared space