Short Version - You must reinstall our Brave extension with new BookMacster/Synkmark versionsDue to changes made by our friends at Brave Browser, you must (1) uninstall and then (2) reinstall either of our browser extensions you have installed in Brave.  To do that, after updating to BookMacster or Synkmark 2.10.21 or later,
- Activate the Brave app.
- Click in the main menu: Window > Extensions.
- Find the card for BookMacster Sync or BookMacster Button.
- Click the button: Remove.  A sheet will appear.
- Click the button: Remove in the sheet.
- Activate BookMacster or Synkmark.
- Click in the main menu: BookMacster/Synkmark > Manage Browser Extesions.
- In the Sync or Button sections, click the Install button for Brave.
- Follow instructions as given.
- Very important: After reinstalling the Sync extension, return to BookMacster or Synkmark and click the corresponding Test button, once or twice until it indicates a happy checkmark in a green circle.
Note that this will not install a newer extension version.  It will simply update the configuration data which is installed for it in Brave's 
local storage, so it can talk with BookMacster/Synkmark 2.10.21 or later.
Longer Version - Background InformationWhen the Brave Browser was first released, its bookmarks had two 
hard folders: 
Bookmarks Bar and 
Other Bookmarks, the same as Google Chrome.  Because such an arrangement is problematic for syncing, in late 2019 the Brave developers decided to 
eliminate the Other Bookmarks and rename the Bookmarks Bar to simply Bookmarks.  This change appeared in Brave 1.2, early January 2020, and was supported by BookMacster and Synkmark in version 2.9.23.  Unfortunately, enough Brave users complained about the change that the boss at Brave directed the developers to 
put things back to the old way.  
Other Bookmarks is therefore returning in Brave 1.7, which is now in Beta and scheduled to be pushed out to all Brave users on 
April 7.  
Update: Looks like they slipped the date to April 14.Other Possible IssuesWith the release of BookMacster and Synkmark 2.10.21 today, we have done our best to detect whether or not users have an 
Other Bookmarks hard folder, and import and export accordingly.  But users of BookMacster and Synkmark who are syncing with Brave will probably see some discontinuities in addition to the discontinuities that will be experienced by all Brave users who depend on their bookmarks.  We have thought of two in particular…
Safe Sync Limit ViolationsBy default, BookMacster and Synkmark will 
stop and warn you if more than 25 significant changes are made during an Import or Export operation.  So if you have more than 25 items in the 
soft Other Bookmarks which was created in Brave 1.2, and either manually or Brave automatically moves them into the resurrected 
hard Other Bookmarks when upgrading to Brave 1.7, the next time BookMacster or Synkmark imports from Brave, the 
Safe Sync Limit violation will occur.  To recover from this, click in the menu to 
File > 
Import from … Brave manually, then ignore the warning that many changes occurred.
Structure Does Not Have Other Bookmarks (aka Bookmarks Menu)If your BookMacster or Synkmark Collection is configured for syncing among Brave and another browser which 
does have an 
Other Bookmarks (aka 
Bookmarks Menu) hard folder, then your BookMacster or Synkmark collection should already have a 
Other Bookmarks (aka 
Bookmarks Menu) hard folder, and your newly-moved Brave Bookmarks in Brave's 
Other Bookmarks will sync to it.  However, if your Collection was created to serve only Brave and another browser which also does not have a 
Other Bookmarks (aka 
Bookmarks Menu) hard folder, then it may not have one, and you may want it to have one.
If you are using BookMacster, you can fix this by clicking the tab 
Settings > 
Structure and switching on the 
Other Bookmarks or 
Bookmarks Menu checkbox.
If you are using Synkmark, you can fix this by clicking in the menu: 
Synkark > 
Preferences.  In the window which appears, click the 
Syncing tab.  First, import any desired changes from browsers.  Then remove 
Brave (or 
Brave Beta) from the list of synced browsers at the bottom, and then re-add it back to the list.