Cannot change Companion's HP from extras.

Hi there. Recently we played Dnd via VTT Maps. My players got homebrew summons(from summon dragon spell) and some default animals(from gray bag of tricks item). Eventually, the bard from my campaign (i play as DM) obtained shield guardian control amulet (and added Shield Guardian to his extras in his CharList). But when it came to combat encounter and recieved damage, i as DM cannot reduce his HP (the was no HP in popup menu). I tried animals/custom dragon - all from companions folder, but they hadn't hp as well. Finally i added token from monsters - it worked. It has HP in menu. 

To the topic:

• When i add token from companions(added to extras before) and click on them HP submenu is missing
• When i added token from monsters and click on them - it has HP submenu

The HP submenu is missing because that token came from a player’s Extras — DDB treats the creature as theirs, not yours. Your Monsters-tab token works precisely because it’s a token you own.

I doubt that changes soon, so the cleaner fix may be to stop owning the number: let the player track the guardian’s HP and you just call the damage. A player can keep the whole stat block and an HP counter on their own sheet — I build a browser extension (Rollwarden) that does this, importing the Shield Guardian’s block from your own DDB books and keeping HP and temp HP on the sheet alongside its attacks.