You can now create and schedule your Instagram posts on Publer through Zapier.
First, let's explain how you can add your Instagram account to Publer.

Add your Instagram account to Publer

Go to Accounts on top of the dashboard and click the + icon. Select Instagram

Please remember:

For the moment, only single-photo posts for Instagram Professional Accounts that have been connected to a Facebook Page are supported.
To convert your Instagram Personal account to a Professional account (Business or Creator), click here.
To connect your Facebook Page to your Instagram Professional account, click here.

Accept the required Facebook / Instagram permissions
Select the Instagram account that you want to add

All you need to do now is create a Publer → Instagram Zap for this account on Zapier.

Create a Publer → Instagram Zap for this account on Zapier

Go to your Zapier dashboard
Connect Publer to Instagram for Business
Select Publish Instagram Photo and Publish Photo
Click Use Zap

Make sure the setup on your Zapier dashboard looks as the following picture and click Go to Advanced Mode:

First, select Publish Instagram photo in Publer

Customize post by selecting your Instagram account

Click on Test trigger

Zapier will show a sample of a Post created in Publer. Simply click Continue

You will be redirected to the second section: Publish photo in Instagram for Business.
Make sure the setup looks like the following picture and click Continue

Check to see whether the desired Instagram account was selected and hit Continue

Check to see if the fields are selected as shown below

Click on Continue and on this step, please SKIP TEST:

Click on Done Editing and Turn On the Zap

Go back to Publer, confirm the Zap connection and start scheduling your Posts

Keep in mind:

Your scheduled Instagram photos in Publer will be published automatically by Zapier. You can also add a location, schedule a first / follow-up comment, view insights and Publer will make sure that Instagram won't mess with the line breaks in your captions.
You need to do the above for every Instagram Business account that you manage.
The free version of Zapier allows you to have up to 5 Zaps and up 100 tasks every month. Think of 5 Instagram accounts and 100 Posts total every month. If you need it for more, you will have to upgrade to one of their paid plans.
Instagram photos can only be in JPG or PNG format, have a minimum resolution of 320x320 pixels and an aspect ratio between 4:5 and 1.91:1.
It appears that Zapier is for the moment not able to access Instagram accounts that are connected via Facebook Business Manager. They're aware of this issue and hopefully they will be able to fix this soon.
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