Avenue 510 is built to keep property representation truthful, and the parts you should understand are where the responsibility sits with you.
Video tours animate the photos you upload. Each clip is generated from your photo, and every motion prompt instructs the model to hold the architecture, furniture, surfaces, and lighting exactly as captured while only the camera moves. That instruction is what the prompts are built around. A generative model is still not a guarantee, so review every clip before you publish, and review it again if you switched on ambient motion, which lets water, foliage, curtains, and fans move.
Preset photo edits are built to stay faithful. Every sky, staging, cleanup, and polish prompt instructs the model to leave architecture, materials, and existing fixtures exactly as captured. Virtual staging only ever adds furniture and decor, and the camera position does not move.
Custom Edit is different by design. It does what you describe, including adding features the property does not have. That is the point of it. Anything you make there is yours to disclose, and using it to hide a material defect or misrepresent a home breaks the Terms.
Disclosure is a control you operate, not something automatic. Every edit page has an MLS disclosure toggle that is off by default. Turn it on before you apply and Avenue 510 burns a disclosure mark into the saved file and tags the library record, so the disclosure travels with every download and share. Left off, nothing is labeled. See virtual staging and MLS disclosure.
Avenue 510 does not write disclosure into EXIF or other embedded file metadata, and it does not produce an MLS disclosure document for you. Rules vary by market, so verify what your board requires before you publish.