Attach base64 image to Allure Reports

[nnson0310]

I am building a selenium framework (Java + Junit5)
I can easily attach screenshot to Allure Report with following code:
File screenshotAsFile = ((TakesScreenshot) driver).getScreenshotAs(OutputType.FILE);
Allure.addAttachment(screenshotName, FileUtils.openInputStream(screenshotAsFile));

But I do not know how to add Base64 image to Allure Reports. I try the following way but it did not work as expected.
It just render a plain text.

String screenshotAsBase64 = "<img src='data:image/png;base64," + ((TakesScreenshot) driver).getScreenshotAs(OutputType.BASE64) + "' style='width: 120px; height: 120px' />";
Allure.addAttachment(screenshotName, screenshotAsBase64);

Please help me to make Allure Reports recognize that I want to render my screenshot as Base64 Type not as a plain text. Thank you

[baev]

You need to specify the correct content type. In your case, you are adding html content, so you need to use text/html