Add files to an existing asset

You can add files to an asset at any point after it is created. Common reasons to add files include:

• Adding subtitle or caption files (.vtt, .srt) — Make your content accessible with captions without re-encoding.
• Adding additional audio tracks — Attach alternate language dubs or audio descriptions to the same asset.
• Uploading an original source file — Reference the master file alongside the encoded outputs.
• Replacing or supplementing encoded outputs — Add a new encoded version alongside existing ones.

Files you upload are stored in the asset’s cloud storage container. After uploading, MK.IO detects the new files and they appear in the asset’s Files on storage list.

Steps

Open the asset

Go to Assets in the left navigation and click the name of the asset you want to update.

Navigate to Files on storage

Scroll down to the Tracks section and select the Files on storage tab. This lists all files currently stored in the asset’s container.

Add files

Click + Add Files. A file picker opens — you can click to browse or drag and drop files directly.

Upload

Select your file or files and click Upload. MK.IO transfers the files to the asset’s cloud storage container.

After uploading, MK.IO reflects the new files in the asset immediately. If you upload a subtitle or audio track file, you may need to create a new transform job or use the track insertion feature to attach it formally to the manifest. See Add a track to a VOD asset.

Supported file types

MK.IO accepts any file type in an asset container — the asset is a general-purpose storage container. However, only recognised media formats are processed for streaming:

• Video: .mp4, .mov, .mxf, .ts, and other common formats
• Audio: .mp3, .aac, .wav
• Subtitles: .vtt, .srt, .ttml
• Manifests: .ism, .mpd, .m3u8 (generated by encoding jobs)

If you need to add a subtitle track to an already-encoded asset without re-encoding, see Add a track to a VOD asset.