This article provides answers for InVision Cloud V7. Not sure which version you're using? Find out.
After migrating a prototype from InVision Cloud V6 to Cloud V7, any public share links created while the prototype was in the Cloud V6 environment will continue to work, with one exception: Cloud V6 links where you have chosen a specific screen for the prototype to start on will not work in Cloud V7. You will need to create a new share link in Cloud V7.
If you’d like viewers to maintain free access to viewing a doc, we recommend sharing a new Cloud V7 public share link. See the section "Creating public links" in this Cloud V7 article: InVision Cloud V7: How do I share a document?