Lucidchart import broken

[06kellyjac]

Preflight Checklist

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

You must search the issue tracker and agree to the code of conduct. You must fill in this entire template. If you delete part/all or miss parts out your issue will be closed.

If you are technical, you should report bugs along the lines of https://marker.io/blog/how-to-write-bug-report. If you are not technical, we will make allowances, please try to make an effort to understand the process.

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Install diagrams.net and draw.io Importer extension
2. Login to lucid.app
3. Attempt to use the extension via the dropdown
4. See "Please login to Lucidchart first, then [try again]"
5. Attempt to use https://app.diagrams.net/tools/lucid/import.html directly
6. See the same error
7. Request https://lucid.app/documents/external?callback=http%3A%2F%2Fdiagrams.net%0A&sa_attempted=1 results in 400 [Lucid API] The browser said storage access was granted, but no cookies were included in the request!

Expected behavior
A clear and concise description of what you expected to happen.

expect to see a list of diagrams to export.

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io version N/A

Desktop (please complete the following information):

• OS: [e.g. iOS] - Linux
• Browser [e.g. chrome, safari] - Brave
• Browser Version [e.g. 22] - 1.85.120 - Chromium 143.0.7499.192

I tested the problem in incognito/private mode with all browser extensions switched off, write "yes" below:

• Yes

Additional context
Add any other context about the problem here.

I did look for the code behind the website/extension to see if I could at least attempt a fix but I couldn't find it in the GH org

[draw-io-triage-bot]

👋 Thank you for opening this issue!

---

Summary: The Lucidchart import feature (both via the draw.io Importer browser extension and the direct import URL) is failing with a cookie/storage access error from the Lucid API, preventing the user from seeing their Lucidchart documents. This is likely related to the user's use of Brave browser, which aggressively blocks third-party cookies required for the cross-origin authentication flow between diagrams.net and lucid.app.

---

📝 Additional Information Needed

To help us investigate this more effectively, could you please provide:

• Have you tried this in a standard Chrome or Firefox browser (not Brave)? Brave's aggressive cookie/tracker blocking is known to interfere with third-party cookie-based authentication flows, which is exactly what the error message '[Lucid API] The browser said storage access was granted, but no cookies were included in the request!' suggests.
• Does the Lucidchart import work if you temporarily disable Brave's Shields (cookie/tracker blocking) for lucid.app and diagrams.net?
• Have you confirmed that third-party cookies are allowed for both lucid.app and diagrams.net in your browser settings?
• Can you reproduce this issue in a mainstream Chromium-based browser (e.g., Google Chrome) to rule out Brave-specific cookie blocking as the cause?

📋 Bug Report Template

**Environment:**
- draw.io version: [e.g., web app / desktop 24.x.x / Confluence plugin]
- Browser (if web): [e.g., Chrome 120, Firefox 121]
- OS: [e.g., Windows 11, macOS 14, Ubuntu 22.04]

**Steps to Reproduce:**
1. Go to ...
2. Click on ...
3. See error

**Expected Behavior:**
What you expected to happen.

**Actual Behavior:**
What actually happened.

**Screenshots/Files:**
If applicable, add screenshots or attach the .drawio file.

---

---

_{🤖 This is an automated response to help with initial triage. A human maintainer will review this issue. If you've provided all the requested information, no further action is needed - we'll get back to you soon!}

[06kellyjac]

Shields down worked.

One other note while I'm here

Refused to apply style from 'https://app.diagrams.net/tools/lucid/mxgraph/css/common.css' because its MIME type ('text/html') is not a supported stylesheet MIME type, and strict MIME checking is enabled.