RDL file size limit for Report Server

Please try to upload large files directly to ReportServer from portal. 

For deployment issue :

You may serach for Timeout property in config on powerBireport server and set that. Its same as legacy report server in web.config

<httpRuntime executionTimeout="9000" requestValidationMode="2.0" />

set it to below (the maxrequestlength is in KB and max value can be set to Max value of integer 2147483647

<httpRuntime executionTimeout="9000" maxRequestLength="100000" requestValidationMode="2.0" />

Apart from this you may set below to higher value in RSReportServer.config for reports that run longer :

<Add Key="DatabaseQueryTimeout" Value="300"/>

<MemoryThreshold>90</MemoryThreshold>

Please mark as solution if this helps!

Thanks!
Abhinav