[Bug]: Generate Custom Template failed
Author: seppel123Created Aug 11, 2026Updated Aug 17, 2026
Labelsbug
Bug type
Regression (worked before, now fails)
Summary
Custom Template generation Faild after Font selection.
there was a bug before that got fixed in 0.9.0.
I updated to 0.9.4 and now i cant create a custom template again.
Error Pop Up: Document preparation failed Gateway timeout. The request took too long to process.
Steps to reproduce
Start new creation - select a template pptx - upload missing fonts - click continue
Expected behavior
It shoudl generate the template preview
Actual behavior
Get the Error message above.
Presenton version
0.9.4 beta
Operating system
Ubuntu 24.01
How are you running Presenton?
Docker
LLM provider
Custom OpenAI-compatible API
Logs / screenshots
Docker Logs:
INFO: [export_runtime] child started pid=441 command="node" "/app/presentation-export/index.cjs" "/tmp/presenton/28bedeb7-d3c4-4ac4-9325-8d899ec0acce/export-task-_eg354hy/export_task.json"
INFO: [export_runtime] child exited pid=441 returncode=0
INFO: [memory] export_task.exit {'rss_mb': 504} extra={'task_type': 'html-to-images', 'returncode': 0}
INFO: [memory] export_task.spawn {'rss_mb': 504} extra={'task_type': 'pptx-to-html'}
INFO: [export_runtime] child started pid=664 command="node" "/app/presentation-export/index.cjs" "/tmp/presenton/28bedeb7-d3c4-4ac4-9325-8d899ec0acce/export-task-qr1e1otv/export_task.json"
INFO: [export_runtime] child exited pid=664 returncode=0
INFO: [memory] export_task.exit {'rss_mb': 504} extra={'task_type': 'pptx-to-html', 'returncode': 0}
INFO: [memory] export_task.spawn {'rss_mb': 506} extra={'task_type': 'html-to-images'}
INFO: [export_runtime] child started pid=680 command="node" "/app/presentation-export/index.cjs" "/tmp/presenton/28bedeb7-d3c4-4ac4-9325-8d899ec0acce/export-task-rczbwuyh/export_task.json"
INFO: [export_runtime] child exited pid=680 returncode=0
INFO: [memory] export_task.exit {'rss_mb': 506} extra={'task_type': 'html-to-images', 'returncode': 0}Impact
No response
Additional information
Mdoels used: GPT 5.4 for Template generation NanoBanana for Images
Source: presenton/presenton