I'm having a similar problem. I am on Community - 5.2.0. If I upload a powerpoint that is 3 mb or smaller, the preview works fine but if that same powerpoint is 4 mb or larger, the preview fails. I've added "content.transformer.JodConverter.extensions.pptx.pdf.maxSourceSizeKBytes=8096" to the alfresco-global.properties file and restarted Alfresco but it didn't help. Am I placing this in the worng place. I'm a noob. Any help would be greatly appreciated.
###############################
## Common Alfresco Properties #
###############################
dir.root=/opt/alfresco-community/alf_data
dir.contentstore=/mnt/alf_data/contentstore
dir.contentstore.deleted=/mnt/alf_data/contentstore.deleted
alfresco.context=alfresco
alfresco.host=xxx.xxx.xxx.xx
alfresco.port=8080
alfresco.protocol=http
share.context=share
share.host=xxx.xxx.xxx.xx
share.port=8080
share.protocol=http
### database connection properties ###
db.driver=org.postgresql.Driver
db.username=removed
db.password=removed
db.name=removed
db.url=jdbc
ostgresql://localhost:5432/${db.name}
# Note: your database must also be able to accept at least this many connections. Please see your database documentation for instructions on how to configure this.
db.pool.max=275
db.pool.validate.query=SELECT 1
# The server mode. Set value here
# UNKNOWN | TEST | BACKUP | PRODUCTION
system.serverMode=UNKNOWN
### FTP Server Configuration ###
ftp.port=21
### RMI registry port for JMX ###
alfresco.rmi.services.port=50500
### External executable locations ###
ooo.exe=/opt/alfresco-community/libreoffice/program/soffice.bin
ooo.enabled=true
ooo.port=8100
img.root=/opt/alfresco-community/common
img.dyn=${img.root}/lib
img.exe=${img.root}/bin/convert
alfresco-pdf-renderer.root=/opt/alfresco-community/common/alfresco-pdf-renderer
alfresco-pdf-renderer.exe=${alfresco-pdf-renderer.root}/alfresco-pdf-renderer
jodconverter.enabled=true
jodconverter.officeHome=/opt/alfresco-community/libreoffice
jodconverter.portNumbers=8100
# Configuration of max size for transformations.
content.transformer.JodConverter.extensions.pptx.pdf.maxSourceSizeKBytes=8096
content.transformer.JodConverter.extensions.ppt.pdf.maxSourceSizeKBytes=8096
### Initial admin password ###
alfresco_user_store.adminpassword=removed
### E-mail site invitation setting ###
notification.email.siteinvite=false
### License location ###
dir.license.external=/opt/alfresco-community
### Solr indexing ###
index.subsystem.name=solr4
dir.keystore=${dir.root}/keystore
solr.host=localhost
solr.port.ssl=8443
### Allow extended ResultSet processing
security.anyDenyDenies=false
### Smart Folders Config Properties ###
smart.folders.enabled=false
### Remote JMX (Default: disabled) ###
alfresco.jmx.connector.enabled=false
