Dropbox connectors: how-to video link; text cleanup (#416)

Author: Paul-Cornell

snippets/general-shared-text/dropbox.mdx

@@ -1,15 +1,20 @@
-1. A Dropbox account. [Get an account](https://www.dropbox.com/try/teams).
+<iframe
+width="560"
+height="315"
+src="https://www.youtube.com/embed/yY9uuSe2UC4"
+title="YouTube video player"
+frameborder="0"
+allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+allowfullscreen
+></iframe>
 
-2. A target source or destination folder in your Dropbox account. [Create a folder](https://help.dropbox.com/create-upload/creating-using-folders-on-dropbox).
+- A [Dropbox account](https://www.dropbox.com/try/teams).
+- A target source or destination [folder](https://help.dropbox.com/create-upload/creating-using-folders-on-dropbox) in your Dropbox account.
+- A Dropbox app for your Dropbox account. To learn how to create an app, click the **App Console** tab on the [Getting Started](https://www.dropbox.com/developers/reference/getting-started) page.
+- Permission for your Dropbox app to read from, and write to, the target folder in your Dropbox account as needed. To do this:
 
-3. A Dropbox app for your Dropbox account. To learn how to create an app, click the **App Console** tab on the [Getting Started](https://www.dropbox.com/developers/reference/getting-started) page.
+  - On the **Permissions** tab of your Dropbox app, check the boxes **files.content.read** or **files.content.write** or both. [Learn more](https://developers.dropbox.com/oauth-guide).
+  - On the **Settings** tab of your Dropbox app, for **App folder name**, set the name of the target folder in your Dropbox account for your Dropbox app to have access to.
+  - Note the remote URL to the target folder, which takes the format `dropbox://<path/to/folder/in/account>`.
 
-4. Permission for your Dropbox app to read from, and write to, the target folder in your Dropbox account as needed. To do this:
-
-   - On the **Permissions** tab of your Dropbox app, check the boxes **files.content.read** or **files.content.write** or both. [Learn more](https://developers.dropbox.com/oauth-guide).
-
-   - On the **Settings** tab of your Dropbox app, for **App folder name**, set the name of the target folder in your Dropbox account for your Dropbox app to have access to.
-
-   - Note the remote URL to the target folder, which takes the format `dropbox://<path/to/folder/in/account>`.
-
-5. An access token for your Dropbox account. [Get a token](https://dropbox.tech/developers/generate-an-access-token-for-your-own-account). Save this token in a secure location. Do not share it with others.
+- An [access token](https://dropbox.tech/developers/generate-an-access-token-for-your-own-account) for your Dropbox account. Save this token in a secure location. Do not share it with others.