Quick Checks
Before diving deeper, verify these basics:
MOD Bundles app is installed and active
You're on a Product template (not homepage or collection)
Your theme supports app blocks (Online Store 2.0)
You're looking in the right place (Apps section in block picker)
Where to Find App Blocks
Step-by-Step Location
Go to Online Store → Themes
Click Edit theme on your active theme
Use the dropdown at the top to select Products → Default product
Click on the main Product information section in the left sidebar
Click Add block
Scroll to the bottom—look for Apps
MOD Bundles blocks should appear under Apps
What You Should See
Under the Apps section in the block picker:
MOD Bundles (for Mix & Match)
Pack Builder (for Pack Builder)
Collection Bundle (for Collection Bundles)
Issue: No "Apps" Section
If you don't see an Apps section at all:
Cause 1: Not an OS 2.0 Theme
Your theme doesn't support app blocks.
How to check:
Is your theme older than 2021?
Does the theme store listing mention "Online Store 2.0"?
Solution: Upgrade to an OS 2.0 theme like Dawn (free) or any modern paid theme.
Cause 2: Wrong Template Location
App blocks can only be added to certain sections of your theme.
Try:
Make sure you're on a Product template
Click on the Product information section (not header/footer)
Try different sections—some themes have multiple areas that accept blocks
Issue: Apps Section Exists But MOD Bundles Missing
If you see the Apps section but MOD Bundles blocks aren't there:
Cause 1: App Not Installed
Check:
Go to Apps in Shopify admin
Confirm MOD Bundles is listed and enabled
If not, install it from the App Store
Cause 2: App Needs Refresh
Sometimes the theme editor needs a refresh to see new app blocks.
Try:
Close the theme customizer
Go to Apps → MOD Bundles (open the app)
Return to the theme customizer
Check for the blocks again
Cause 3: Theme Cache
Try:
Hard refresh the theme customizer (Ctrl+Shift+R or Cmd+Shift+R)
Clear browser cache
Try a different browser
Try an incognito window
Issue: Block Added But Not Visible on Page
If you added the block but it doesn't show on the live page:
Cause 1: Block Is Hidden
Check if the block is set to hidden:
Click on the block in the sidebar
Look for an eye icon or visibility toggle
Make sure it's set to visible
Cause 2: Wrong Product Page
The app block shows bundle UI only on bundle products.
Check:
Are you viewing a bundle product? (created through MOD Bundles)
Is the product using the template with the block?
Try viewing directly:
yourstore.com/products/your-bundle-name
Cause 3: Theme Didn't Save
Try:
Open theme customizer
Make a small change (move a block)
Click Save
Hard refresh the storefront
Issue: Block Shows in Editor But Not Live Site
If the block appears in the customizer preview but not on your actual store:
Cause 1: Viewing Wrong Template
In the customizer, you might be editing a different template than what your product uses.
Check:
Go to Products in Shopify admin
Click your bundle product
Note the Theme template in the sidebar
Make sure that's the template you edited
Cause 2: Theme Not Published
You might be editing an unpublished theme.
Check:
Go to Online Store → Themes
Make sure your current theme is the one marked "Live"
If you edited a different theme, publish it
Cause 3: Browser Cache
Try:
Hard refresh (Ctrl+Shift+R or Cmd+Shift+R)
Open in incognito mode
Clear all browser cache
Issue: Only Some Blocks Appear
If you see some MOD Bundles blocks but not all three:
This Is Normal If...
You haven't created all bundle types yet. Each block type corresponds to bundles you've created:
Mix & Match Bundle block → appears when you have Mix & Match bundles
Pack Builder block → appears when you have Pack Builder bundles
Collection Bundle block → appears when you have Collection Bundles
Solution: Create a bundle of each type you want to use, then the blocks should appear.
Theme-Specific Issues
Dawn Theme
Dawn should show all blocks without issues. If not:
Make sure you're on the latest Dawn version
Try the Product information section specifically
Third-Party Themes
Some themes handle app blocks differently:
Check the theme's documentation for "app block" instructions
Contact the theme developer if blocks consistently don't appear
Try their support resources
Still Not Working?
If you've tried everything above:
Take screenshots:
The block picker (showing Apps section or lack thereof) Your theme name and version The Product template you're editingContact support:
Share your Shopify store URL Include the screenshots List what you've already tried
We can help identify if it's a theme issue, app issue, or configuration problem.