Tags for preview panel settings don't work when more than one field is used

[raherin]

Description

When following the documentation for adding fields to the preview panel, only the last field will show in the panel if more than one field is chosen in the layer settings.

Steps to reproduce

• Download this project: mergin_preview.zip
• Open the settings for the 'Survey' layer
• In the 'Display' tab, set the Map Tip to

# fields
type
floors
updated

• Upload the project to Mergin Maps using the Plugin
• Download the project in the Mobile App
• Open the project and select any feature to view the preview
• Only the 'updated' field value is shown

Software versions:

• Mergin Maps v2025.4.1 (Android 15)
• Mergin Maps Plugin v2025.3.1
• QGIS 3.40.8 (Windows 11)

[JuanPufleau]

Thanks for logging this issue, raherin.

As a workaround while this gets sorted out, you can use the plain HTML syntax in the HTML Map Tip to partly mimic the behaviour of the #fields, with something like the below, with the syntax [%"field"%] to display the contents of fields.

<font size=2>Vegetation Quality:<br></font><font size=3><b>[%"VegQAssess"%]</b></font><hr> <font size=2>EVC: <br></font><font size=3><b>[%"EVC"%] </b></font><hr> <font size=2>NRA: <br></font><font size=3><b>[%"NRA"%] </b></font><hr> <font size=2>Captured by: <br></font><font size=3><b>[%"UserId"%] at [%"TimeStampStr"%] </b></font>

That will display like:

Vegetation Quality:
Good

---

EVC:
Environment Vegetation Class

---

NRA:
Natural Reserve Area

---

Captured by:
[%"UserId"%] at [%"TimeStampStr"%]

Those font sizes look different on different platforms, but it's something we can use at the moment.