For the record, as with nearly every feature I have requested or voted on in this forum, you can already do this in Figma.

File/Spec sharing is done completely differently in Figma. ReadOnly viewers are seeing the actual design document; not a secondary URL. This means that annotations can exist outside of artboard ("frames" in Figma).
It also means that users can comment directly in the project file rather than in a secondary URL. This keeps the communication to a central location.

The biggest item missing is the ability to create a text note/requirement and tag it to an action or element on the page. Giving developers the ability to view these notes to help them understand the expected functionality is critical for less rework and saving time/cost on a project.

This idea should probably be merged with this one: https://adobexd.uservoice.com/forums/353007-adobe-xd-feature-requests/suggestions/18722263-add-ux-notes-mode-to-design-and-prototype

Balsamiq has a similar feature. You can add a sticky note and make a comment without having to go to a browser. It would be nice to have something similar, or something like Google Docs with lets you highlight something and add a comment to the right column of the screen. The feature would need to be toggled on or off.

Would need the annotations to travel with the artboard when an artboard is moved (and possibly when duplicated?) Also to not be visible in a review link. If the notes were only visible when guide are visible so they could be hidden as an option would be a plus.

It seems like you believe you answered this request with the commenting feature. That is flawed because it only works if you're sharing the document. There's no way to even see those comments in Design mode, let alone add them.

I'd use this to explain features that I can't illustrate via the tool itself. Because this feature doesn't exist, I'm forced to copy the artboard into a two-column Word table where I can put my notes in the second column. Such a hassle that I've stopped using XD for some projects and instead just go old school and use text to explain what it should look like. I would prefer the ability to format the annotation with bullets, bolding, etc.

+1. We're finding not being able to added functional spec into the design problematic for our workflow. Using the commenting functionality to do so in Review mode, doesn't work as final decisions can get buried down in the comments.

As designers we need to be able to clearly articulate final spec separately. Being able to do this in the context of the design/wireframe as annotations is invaluable in conveying these to developers.

Would be nice too, to be able to enumerate acceptance criteria that relates back to specific user stories.

This seems to be an obvious missing piece to making XD a more effective collaboration tool.

포토샵과 같은 메모 기능이 있으면 좋을 것 같습니다.

It would be nice if you had a memo feature like Photoshop.

The ability to open up a panel with annotations in a pane to assist in live amendments without having to open the browser.

To be able to add notes when clicking on the board, this can be a simple text editor with ability to adding external links, same goes for any selected element, I find it very useful feature to remember why I added this element or to explain what this board is about, it also helps communicate ideas with deverlopes, colleagues and clients.

Simple indicator using simple text where designers can add notes or comments regarding specific artboards. For instance, I would love to include a comment for the dev team that includes links to Google Material components used on an artboard so they don't panic and think they have to code it on their own. The note would be transferred to the spec in the already available comment section. Pretty please. Thank you.

Any updates on this? Creating annotations is crucial - I can't believe this doesn't exist already...

It would be great to be able to add your own notes to various artboards that aren't shown on the mockups flow themselves

A comments feature could benefit individuals and teams for personal and collaborative notes.

It would be nice for other people to add notes to the prototype and those notes will be saved in the design file. I already know about the comment feature, but it's nice to see the notes by the screens in the design files, vs trying to find the comments and I could forget about them.

This is definitely a must have. I need to add notes about behavior and details around how things should be implemented once build. At the moment I have to keep track of my notes while designing, and then add them to the published design specs, which is more admin that I would like to have...

Would love to see a visual indicator in the design specs which artboards have assets and in the live file the layers, artboards, assets or some addition UI palette should make it easier to find and manage assets marked for export. Having control over the export options as well would be great. Or potentially having a "placeholder" version that is marked obviously but as the designer I could go back and manually save assets later for the dev. In this way I get full control but do not block them moving forward.

We need to be able to add notes that will optionally appear in exported PDFs and optionally appear in published prototypes. Depending on the audience we want to show the notes or not...having it there but optional when sharing would go a long way to closing the loop between designer and dev.

Designers need to be able to communicate important behaviors to developers via notes but we also need to hide these notes when exporting artboards as PDF or other formats. These "design" notes should not be visible in published prototypes--they serve a purpose different than the comments within prototypes. It's a nightmare trying to effectly communicate behavioral information to developers via another means. The most effective way is to attach call outs or notes right within visual designs. We all look forward to your solution to this problem. Thanks!