> ## Documentation Index > Fetch the complete documentation index at: https://docs.udiconnect.io/llms.txt > Use this file to discover all available pages before exploring further. # Submission History Timeline > Track the submission progress per registration version, from UDI Hub processing to authority handover, authority response, and publication. ## Overview The **Submission History** (Status Timeline) helps you understand what happened to a **specific registration version** of a **Basic UDI-DI** or **Device**. It is available inside the **Details modal** and provides a clear timeline of the submission lifecycle — including technical handover to the authority, the authority’s response, and the final publication status. *** ## Where to find it 1. Open **UDI Management**. 2. Open the **Details** modal of a **Basic UDI-DI** or a **Device**. 3. Select the tab **Submission Status**. 4. Use the **Version** dropdown (top right) to switch between **registration versions** and see the corresponding submission history for each version. Submission Status Timeline - successful example Submission Status Timeline - successful example *** ## How to read the timeline The timeline is divided into four stages: | Stage | Meaning | | ------------------------ | ------------------------------------------------------------------------------------------------------------------ | | **Submission Interface** | The submission is being processed inside **UDI Hub** (payload generation, orchestration, submission to authority). | | **Authority** | The submission was technically handed over to the authority system (e.g., EUDAMED). | | **Authority Response** | The authority returned a response indicating **success** or **error** (including details). | | **Published** | The item was successfully **published** by the authority and is considered finalized for that version. | ### Successful flow example In a successful case, all stages are completed and **Published** is reached. Successful submission timeline reaching Published Successful submission timeline reaching Published ### Error / rejection example If the authority rejects the submission, the timeline stops at **Authority Response** and shows the error details provided by the authority. Rejected submission timeline with authority error details Rejected submission timeline with authority error details *** Use the Version selector to compare what changed between submissions (e.g., Version 1 initial registration vs. Version 2 update) and to identify exactly where a submission failed (UDI Hub processing vs. authority response).