Skip to main content

Get Support
Have a question? Let's get you an answer!

How Do I...? Troubleshooting Code & Webhooks Developer Zone

Other Help Resources
Wait, there's more! Check out these Community sourced spaces for additional resources.

Zapier Help Center Hire an Expert

Learning Resources
All of our best learning resources can be found here.

Featured Articles Show & Tell Asked & Answered Zapier's products AI Hub Zapier Tools Hub

Share your knowledge
Give back to the Community by sharing your automation wins and helping to answer questions.

Share your success See unanswered questions User Groups

Other Learning Resources
Some of our favorite additional ways to upskill your Zapier knowledge.

Zapier Learn Zapier Blog Zapier Webinars

Product Updates
Check out what is new and upcoming with Zapier with our regular product updates.

Product Updates

Early Access Program
Want to join Early Access? Learn more here.

Question

I get this error: "undefined method 'thumbnail' for an instance of Media::Video". How do i attach a thumbnail when setting up Publer Video post

  • May 21, 2026
  • 3 replies
  • 21 views
B

When i was trying to post my video using Publer, I uploaded the media to Publer and it succeed, after that the ‘auto schedule post’ return the error as shown below:

Post failed: {"post_0":[{"account_id":"67fe102a51e9c****ad94c68","account_name":"********* Academy","provider":"youtube","message":"undefined method 'thumbnail' for an instance of Media::Video"}

This happened and i don’t know what to do to fix this situation, even when all credentials have been filled. When i post a picture on Publer, it works perfectly, but when i change the media file to a ‘video’. It shows this error and there is no credential for ‘thumbnail’ that i can work on 

3 replies

F
Forum|alt.badge.img+3
  • Fahad SZapier Solution Partner
  • Zapier Solution Partner
  • May 21, 2026

Hi ​@bentosquid 

Here's the Publer doc that might help: Link
Link: Automate Social Media with Publer + Zapier

If you're still running into issues, drop a screenshot of the error and a quick description of what your Zap is doing, happy to take a look!

And if you'd rather just get it sorted quickly, I offer a free 20-min Zapier troubleshooting call. Book it under Resources on my Zapier Directory profile: https://zapier.com/partnerdirectory/automatemybiz

 

F
Forum|alt.badge.img+3
  • Fahad SZapier Solution Partner
  • Zapier Solution Partner
  • May 26, 2026

Hi ​@bentosquid just checking in — did you manage to resolve this?

SamB
Community Manager
Forum|alt.badge.img+11
  • SamBCommunity Manager
  • Community Manager
  • June 3, 2026

Hey there ​@bentosquid 👋

I did some checking on our side but couldn’t see any similar reports of that same “undefined method 'thumbnail' for an instance of Media::Video” error, but judging by the wording of the error it sounds like it’s trying to set a thumbnail for the video and that’s not supported. 

I'd recommend reaching out to our Support team so they can investigate further. In the meantime, it might also be worth trying the Create Post action to see if the same error comes up there, as that would help the Support team narrow things down.

Let us know how it goes!

Terms & ConditionsAccessibility statement