The following features in PowerPoint are not supported:
General
It is recommended to close the PowerPoint template before “local” merging.
Leaving the template open in PowerPoint during a “local” merge operation can sometimes produce unusual results in the output file.
RichText and Image fields when using dot notation or formal style merge fields.
Field types do not produce the desired result if the style of merge field is like the following example:{{HTML:QueryName.FieldName}} or {{Image:QueryName.FieldName}}
RichText fields are limited to using only one line break. If two or more line breaks are required in your merge field, it is recommended to either use a Text field, or utilize a Word template instead.
Tables
PowerPoint tables do not accept an image in-line with text, however Conga can insert an image as a cell background.
Text Boxes and Shapes
SmartArt (PowerPoint’s tool to create charts and process flows) is not currently available in a programmatic fashion.
When merging data that contains new line characters, it is recommended to use a single font for the entire text box or shape.
IF Statements
If statements are only functional in Microsoft Word templates when using Conga Composer.
PowerPoint does not have this functionality. A workaround is to create an IF formula field in Salesforce.
PowerPoint cannot perform calculations such as like =SUM(ABOVE)).
A workaround is to use a formula field in Salesforce to perform calculations and merge the result into the table.
SOQL Queries
Nested SOQL Queries used to gather data are not supported in PowerPoint templates