Instrumenting Amplitude Session Replay with Google Tag Manager requires a different procedure than the standard [Browser SDK Plugin](/docs/sdks/session-replay/session-replay-plugin).

{% callout type="note" %}
This article applies to **client-side** GTM instrumentations only.
{% /callout %}

## Enable Session Replay

To instrument Session Replay with Google Tag Manager:

1. Add the [Google Tag Manager Web Template for Amplitude Analytics Browser SDK](/docs/data/source-catalog/google-tag-manager) if you haven't enabled it.

{% callout type="note" heading="Update the Amplitude tag template" %}
  The latest version of the Amplitude Analytics Browser SDK template includes a Session Replay toggle.
{% /callout %}

2. In Google Tag Manager, create a new tag using the Amplitude template, or edit an existing tag based on the template.
3. In the tag's *Initialization* section, select **Enable Session Replay Plugin**.
4. In Amplitude, navigate to *Organization Settings > Session Replay Settings*. Update any [masking](/docs/sdks/session-replay/session-replay-plugin#mask-on-screen-data), [sample rate](/docs/sdks/session-replay/session-replay-plugin#sampling-rate), or other settings.

## Troubleshooting

Multiple instantiation of the Amplitude SDKs is a common problem with GTM and other code injection frameworks. Make sure the initialization logic runs only once in your app. Multiple instantiation can happen if:

- More than one "Init Tag" or another custom tag runs Amplitude.
- Another code injection framework (for example, SquareSpace or Bubble) also runs Amplitude.

This template uses the Amplitude Browser SDK Plugin. For troubleshooting help, refer to [Troubleshooting | Session Replay Plugin](/docs/sdks/session-replay/session-replay-plugin#troubleshooting).