Generated image result from one LLM cannot be directly inputed into another LLM (output from first LLM is text string not file format) #20625

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opened 2026-02-21 20:08:14 -05:00 by yindo · 1 comment
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Originally created by @Valentino-L on GitHub (Nov 27, 2025).

Originally assigned to: @fatelei on GitHub.

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  • I have read the Contributing Guide and Language Policy.
  • I have searched for existing issues search for existing issues, including closed ones.
  • I confirm that I am using English to submit this report, otherwise it will be closed.
  • Please do not modify this template :) and fill in all the required fields.

1. Is this request related to a challenge you're experiencing? Tell me about your story.

I am using dify for nano banana image generation. There isn't an option to link one LLM node directly to another and use the first generated result as an input image to the next LLM. When vision is enabled for the second LLM node, I cannot find the variable that corresponds to the result of the first LLM. This is because the output from first LLM is a text string not a file format. How can I make the first LLM node ouput file format?

Image

2. Additional context or comments

No response

3. Can you help us with this feature?

  • I am interested in contributing to this feature.
Originally created by @Valentino-L on GitHub (Nov 27, 2025). Originally assigned to: @fatelei on GitHub. ### Self Checks - [x] I have read the [Contributing Guide](https://github.com/langgenius/dify/blob/main/CONTRIBUTING.md) and [Language Policy](https://github.com/langgenius/dify/issues/1542). - [x] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [x] I confirm that I am using English to submit this report, otherwise it will be closed. - [x] Please do not modify this template :) and fill in all the required fields. ### 1. Is this request related to a challenge you're experiencing? Tell me about your story. I am using dify for nano banana image generation. There isn't an option to link one LLM node directly to another and use the first generated result as an input image to the next LLM. When vision is enabled for the second LLM node, I cannot find the variable that corresponds to the result of the first LLM. This is because the output from first LLM is a text string not a file format. How can I make the first LLM node ouput file format? <img width="750" height="426" alt="Image" src="https://github.com/user-attachments/assets/62b2ba00-18e3-4b19-9e00-0c98a83e9829" /> ### 2. Additional context or comments _No response_ ### 3. Can you help us with this feature? - [ ] I am interested in contributing to this feature.
yindo added the 🌊 feat:workflow label 2026-02-21 20:08:14 -05:00
yindo closed this issue 2026-02-21 20:08:14 -05:00
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@dosubot[bot] commented on GitHub (Jan 24, 2026):

Hi, @Valentino-L. I'm Dosu, and I'm helping the Dify team manage their backlog and am marking this issue as stale.

Issue Summary:

  • You reported that the output from one LLM node in Dify is a text string rather than an image file.
  • This prevents chaining the output directly to another vision-enabled LLM node.
  • You are seeking a way for the first LLM node to output an image file format.
  • There has been no further activity or responses on this issue so far.

Next Steps:

  • Please let me know if this issue is still relevant with the latest version of Dify by commenting here.
  • Otherwise, this issue will be automatically closed in 15 days.

Thank you for your understanding and contribution!

@dosubot[bot] commented on GitHub (Jan 24, 2026): Hi, @Valentino-L. I'm [Dosu](https://dosu.dev), and I'm helping the Dify team manage their backlog and am marking this issue as stale. **Issue Summary:** - You reported that the output from one LLM node in Dify is a text string rather than an image file. - This prevents chaining the output directly to another vision-enabled LLM node. - You are seeking a way for the first LLM node to output an image file format. - There has been no further activity or responses on this issue so far. **Next Steps:** - Please let me know if this issue is still relevant with the latest version of Dify by commenting here. - Otherwise, this issue will be automatically closed in 15 days. Thank you for your understanding and contribution!
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Reference: langgenius/dify#20625