Self Checks

• 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.

During single-step LLM node debugging, when processing files referenced through custom file variables (e.g., my_file) rather than sys.files, images fail to be forwarded to the LLM because the variable pool lookup misses these custom references.

We should enhance the file resolution logic in single-step debugging mode: if the initial variable pool lookup fails, the system should automatically attempt to locate the file in sys.files as a secondary check.

2. Additional context or comments

my llm node settings like this

You can see why by looking at the code below, because there is no my_file variable in the variable pool in the single-step run

3. Can you help us with this feature?

• I am interested in contributing to this feature.