Files and images - OverControl

Bring your own context into OverControl Chat by attaching a document or image to your message. Ask for a summary, a comparison, an explanation, or a specific detail from the attachment. You do not need an API key.

Supported attachments

Attachment	Formats	How Chat uses it
Images	JPEG, PNG, WebP	Vision reads the image content.
Text	Plain text, Markdown, CSV, JSON	Chat extracts text for Fast, Expert, or Vision to use.
PDFs	PDFs with extractable text	Chat extracts text. PDF page images, layout, and embedded diagrams are not analyzed as images.

Office documents, archives, audio, and video are not currently supported as Chat attachments. Export a document to a supported text format or a PDF with selectable text before uploading it. For a scanned PDF, provide clear JPEG, PNG, or WebP images of the relevant pages and choose Vision. A PDF that contains only scanned images may have no text for Chat to extract.

Attach and ask

Choose a mode

Open Chat and select Vision for images. Choose Fast for a document summary or Expert for a more detailed review.

Add your files

Use the attachment control in the message composer. Wait for the upload to finish before sending your message.

Describe the result you need

Ask a question that refers to the attachment. When using several files, identify them by name and explain how they relate.

Review and refine

Check important details against the original files. Ask follow-up questions in the same conversation while the relevant content remains available.

For a document:

Compare the two attached proposals. Create a table of scope, deadlines, and open questions.
Use only the supplied files and mark anything that is not specified.

For an image:

Describe the chart in this image. Identify the main trend and any labels you can read.
Say when a value is too small or unclear to interpret.

Attachment limits

Limit	Current value
Files per message	3
File size	5 MiB per file
Combined attachment size	10 MiB; the upload request must also fit the service’s request-size limit
Text supplied per file	Up to 12,000 tokens; longer extracted text can be truncated
Attachment context	Up to 10 MiB of file data and 60,000 characters of extracted text
Image preparation	Images may be resized to fit within 1,280 × 1,280 pixels before upload

A MiB is 1,048,576 bytes. Upload size and extracted-text size are different limits: a small PDF can still contain too much text. Long conversations also use context, so a successful upload does not mean an entire document will fit in every follow-up request. For long documents, upload the relevant section or split the work across focused conversations. For images with small text, crop to the area you want analyzed before attaching it.

Solve common attachment problems

What happens	What to check
File type is rejected	Use one of the supported formats above. Renaming an extension does not convert a file.
Upload is too large	Reduce each file below 5 MiB and keep the combined size comfortably below 10 MiB to leave room for the upload request.
PDF has no readable content	Check that its text is selectable. For scanned pages, attach images and choose Vision.
Extraction or context limit is reached	Use a shorter excerpt or fewer documents. Start a fresh conversation for a separate document set.
An image answer misses small details	Choose Vision and upload a clear crop. Resizing can make small text harder to read.
Upload is temporarily rate limited	Let the current upload finish, wait, and try again with fewer files. Avoid repeated rapid retries.
An earlier attachment is unavailable	It may have expired or been deleted. Reattach a copy if you still have the original.

Storage and deletion

Attachments are stored so they can be used in your conversation; closing a tab does not delete them. Chat currently applies a 30-day retention period, with attachment expiry handled separately from conversation expiry. Removing an attachment from the message composer prevents it from being sent in that message. To manage stored uploads, open Settings, find Manage Files under the data controls, and use Manage. Deleting a conversation does not by itself guarantee immediate deletion of every uploaded file. See Privacy and security for the distinction between conversation deletion, attachment deletion, and automatic expiry. Chat attachments are separate from files uploaded through the developer API.

​Supported attachments

​Attach and ask

​Attachment limits

​Solve common attachment problems

​Storage and deletion

Supported attachments

Attach and ask

Attachment limits

Solve common attachment problems

Storage and deletion