What is your goal?
Send a short 2–3 sentence AP-style blurb (generated by OpenAI) above the link preview when posting RSS articles to my Facebook Page using the Facebook Pages “Create a post” module.
What is the problem & what have you tried?
The core problem: The Facebook Pages “Create a post” module is not sending any value for “Post caption” to Facebook, even though the text is correctly generated and mapped.
Scenario flow:
RSS Watch feed items → OpenAI Chat Completion → Tools Set variable (“AI Caption” mapping choices[0].message.content) → Tools Text Aggregator (Single text) → Facebook Pages “Create a post”
In every run history, the INPUT bundle for the Facebook module shows only:
- Link: [correct article URL]
- Page: [correct page ID]
There is no “Post caption:” line at all.
The post is created successfully with the link preview and featured image, but the AI-generated 2–3 sentence blurb never appears above it.
What I have tried (all on iPhone only):
- Direct mapping from OpenAI choices[0].message.content
- Set variable + {{trim(toString(…))}}
- Text Aggregator (Single text) placed before Facebook, mapping aggregator output to Post caption
- Multiple deletions and recreations of the Facebook module
- Verified Link field receives individual article URL (not the /feed URL)
Additionally, I’m stuck in a support loop: I cannot reach the official ticket form. Email to helpdesk@make.com bounces back asking me to use the in-app form, but Help → Contact Support loops without opening a form.
Screenshots attached showing:
- OpenAI module output
- Multiple Facebook run histories with empty/missing Post caption in INPUT
- Facebook module with Text Aggregator mapped to Post caption
Any insights or known workarounds (especially ones that work well on mobile) would be very helpful.
Thank you!
Error messages or input/output bundles
See attached screenshots of run history INPUT bundles (Post caption is missing/empty)
Screenshots (scenario flow, module settings, errors)
Hello,
It looks like your mapping for the post caption is not working.
Could you please add a screenshot of your scenario?
Meanwhile- some ideas to help you solve problem on your own.
Why are you using this combination?
mapping choices[0].message.content → Tools Text Aggregator (Single text)
It can be as simple as this:
Also, if you want to merge multiple RSS feed items into one post, it would be more convenient to do it before OpenAI so it can generate the post based on multiple sources.
Have a nice day,
Michal
Hi @mszymkowiak,
Thank you for the quick reply.
Here is a screenshot of my current scenario flow:
Additional context:
I am combining multiple RSS feeds on my WordPress site using WPematico, which generates a single unified feed that the RSS module consumes. So the scenario starts from one clean RSS feed.
As you can see in the flow:
• RSS (1) → OpenAI (3) → Tools Set variable (6) → Tools Text Aggregator (8) → Facebook Pages (9)
OpenAI generates the 2–3 sentence AP-style blurb correctly.
The Set variable and Text Aggregator both handle the text properly.
However, when mapped to Post caption in the Facebook module (with RSS URL in the Link field), the INPUT bundle still shows no “Post caption” value at all — only Link and Page ID appear.
I’ve tried:
• Direct mapping from OpenAI choices[0].message.content
• Set variable + {{trim(toString())}}
• Text Aggregator (Single text) with its output mapped to Post caption
• Multiple recreations of the Facebook module
Would switching to Set multiple variables instead of Set variable + Text Aggregator help? Or is there a known limitation with the Facebook Pages module when passing generated text alongside a Link?
Thanks again for any insights!
Hi @mszymkowiak,
Per your suggestion.
I tried your recommendation with Tools → Set multiple variables (mapping choices[0].message.content into a variable and then to Post caption). Unfortunately, I got the same result — “Post caption” is still missing from the INPUT bundle.
I also tried bypassing the native Facebook Pages module by using HTTP → Make a request directly to the Graph API (/feed endpoint with message, link, and access_token). However, I was unable to complete it because I could not retrieve or generate the required Page Access Token on iPhone (the token is not visible in the connection details, and the Graph API Explorer gave a “Facebook Login unavailable” error).
For completeness:
• OpenAI generates the text correctly.
• All intermediate modules (Set variable / Set multiple variables / Text Aggregator) show the text properly.
• The problem only occurs at the final Facebook step when a Link is provided.
Is this a known limitation of the Facebook Pages connector? Any recommended workarounds (especially ones that work on mobile) would be appreciated.
Thanks again!
Hello, thank you so much for the details.
Your module details clearly state that the input for Post caption is empty.
Please try adding text directly into your module (without any mapping) and right-click on the module and use Run this module only. If the created post is empty once again - there is definitely an error on Facebook’s side.
But if this makes your post publish correctly- there is definitely an error with your scenario.
Are you mapping the text aggregator output to Facebook Pages?
