--- title: Adding Files To Event Attributes For Backing Tracks / Accompaniment description:   Opus1.io supports uploading files to your event-based services (recitals, concerts, etc.) to use for accompaniments, backing tracks, etc. To create an event attribute for uploading files, navigate t --- [Skip to content](https://kb.opus1.io/adding-files-to-event-attributes-for-backing-tracks-accompaniment#main-content) English Show submenu for translations ![Opus1-3-icon-color-1.png\]](https://kb.opus1.io/hs-fs/hubfs/Opus1-3-icon-color-1.png?height=50&name=Opus1-3-icon-color-1.png) Open main navigation Close main navigation - English Show submenu for translations - Go to opus1.io Go to opus1.io Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [opus1io Knowledge Base](https://kb.opus1.io/?hsLang=en) 2. [Services](https://kb.opus1.io/services?hsLang=en) 3. [Events](https://kb.opus1.io/services?hsLang=en#events) # Adding Files To Event Attributes For Backing Tracks / Accompaniment   [Opus1.io](http://Opus1.io) supports uploading files to your event-based services (recitals, concerts, etc.) to use for accompaniments, backing tracks, etc. To create an event attribute for uploading files, navigate to your events-based service and click **Edit Event.** ![Adding Files To Event Attributes1](https://kb.opus1.io/hs-fs/hubfs/Adding%20Files%20To%20Event%20Attributes1.png?width=688&height=353&name=Adding%20Files%20To%20Event%20Attributes1.png)   Then select **Add Attribute.** ![Adding Files To Event Attributes2](https://kb.opus1.io/hs-fs/hubfs/Adding%20Files%20To%20Event%20Attributes2.png?width=688&height=486&name=Adding%20Files%20To%20Event%20Attributes2.png)   Give your attribute a name ("backing track" below), then select **File/URL**. If you want your file/link to appear in the Opus1.io-generated program, toggle **Appear in the program.** ![Adding Files To Event Attributes3](https://kb.opus1.io/hs-fs/hubfs/Adding%20Files%20To%20Event%20Attributes3.png?width=688&height=571&name=Adding%20Files%20To%20Event%20Attributes3.png)   Next, navigate to a session of your events-based service. On an event performance slot, click the space beneath your file attribute ("backing track" below) - then select either **click to provide a link** to add a URL to the event performance slot or -  ![Adding Files To Event Attributes4](https://kb.opus1.io/hs-fs/hubfs/Adding%20Files%20To%20Event%20Attributes4.png?width=688&height=421&name=Adding%20Files%20To%20Event%20Attributes4.png)   Click **Click to upload a file** to upload a file to the event performance slot. **Note:** Each file needs to have a maximum file size of 200MB. ![Adding Files To Event Attributes5](https://kb.opus1.io/hs-fs/hubfs/Adding%20Files%20To%20Event%20Attributes5.png?width=688&height=425&name=Adding%20Files%20To%20Event%20Attributes5.png)   You can also provide a link to a file hosted on an external site (e.g. Youtube). 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