> ## Documentation Index
> Fetch the complete documentation index at: https://docs.merciv.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sources and attachments

> Point the assistant at specific files, folders, and web pages, or attach files directly to a message.

By default the assistant chooses its own sources — your knowledge base, the web, and market intelligence. When you already know where the answer should come from, you can scope the question yourself or attach the files directly.

## Add Sources

The **Add Sources** button (the dashed plus above the composer) opens a search where you can pin your question to specific sources:

* **Files** and **folders** from your [Knowledge](/knowledge/overview) library
* **Web pages** — paste a URL to add it as a web link source

Selected sources appear as removable chips above the composer. Source sets you've used before are remembered as recent **Sources** groups, so you can reapply the same scope in one click.

Two shortcuts:

* Typing **/** in the composer opens a quick menu to insert a web-page tag inline.
* The **Web** toggle turns web search off entirely for a message — useful when you want the answer grounded only in your own documents.

## Attaching files

Attach files to a message three ways: click the **paperclip** button, drag and drop onto the composer, or paste a file.

### Supported file types

PDF, Word (doc/docx), PowerPoint (ppt/pptx), Excel (xls/xlsx), CSV, plain text, Markdown, HTML, XML, JSON, and images (jpg/jpeg/png/webp).

### Limits

* **5 files** per message
* **25 MB** per file
* **100 MB** combined per message

Empty (0-byte) files and duplicates with the same file name are rejected. If some files in a batch fail validation, the valid ones still attach. On success, a toast confirms what was added, for example "Added 2 files · Total: 12.4MB".

## Adding attachments to your private knowledge

After you send a message with attachments the platform can index, a popup asks: **"Add N files to your private knowledge?"**

* **Confirm** to add the files to your Personal Data in [Knowledge](/knowledge/uploading-files). Processing happens in the background and can take a few minutes; once indexed, future chats can find and cite them without re-attaching.
* **Dismiss** to keep the files scoped to that message only.

<Tip>
  Attach a file when it matters for one question. Add it to your private knowledge when you expect to keep asking about it.
</Tip>