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Fuse keeps your CRM up to date with the work it does for you: the contacts it finds, the companies behind them, the emails and LinkedIn messages it sends, and how people respond. Every CRM models that work differently, so the same Fuse action can look quite different depending on which CRM you use. This page is the map.

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The short version

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Why they differ

CRMs disagree about what an “activity” is. HubSpot has purpose-built objects for emails and calls, so a sent email becomes a real email engagement and a dialer call becomes a call record. LinkedIn messages have no natural equivalent, so they become tasks. Salesforce, Zoho and Pipedrive model activity as tasks or activity records, so that is what Fuse creates. Zoho has a native Calls module, so dialer calls go there instead of becoming tasks. Attio has no activity object at all, only notes. Everything Fuse records there becomes a note on the person.
Attio’s Emails tab is filled exclusively by Attio’s own mailbox sync and is not open to other tools, so Fuse cannot write into it. Your sent emails are there, under Notes. See troubleshooting for the one-time fix that puts them in the Emails tab natively.

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Two behaviours worth separating

These work in opposite directions, and conflating them causes most of the confusion.

Activity is written once

When Fuse sends an email it creates one record and never touches it again, as a permanent log of something that happened.

Engagement is kept current

When someone opens, clicks or replies, Fuse overwrites the fields on their record so they always show where that person stands today.
That is why opens and clicks never appear on the sent-email record itself. They happen afterwards, and they live on the contact instead.

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What controls it

Contact and company syncing is configured per CRM in the Fuse app, under Settings → Integrations. Choose your CRM, then open the Sync tab. Activity and engagement syncing are on by default and have no toggle in the app yet. If you need either turned off for your workspace, contact support.
Push contact records is the foundation. Activity and engagement both attach to a contact record, so while it is off there is nothing to attach to and both are skipped rather than queued.

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Where to go next

Contacts and companies

Who gets pushed, and when.

Emails, calls and LinkedIn

What a sent message becomes in each CRM.

Engagement on contacts

The opened, clicked and replied fields.

Troubleshooting

When something is not showing up.