Export PNG in Lightroom

[joao.pbm.cruz]

Hi everyone!

I have a problem that Lightroom is not exporting PNG's with transparency on some files. My process is usually this, if it might help: I import the RAW files, edit them, then send them trough Lightroom to edit them in Photoshop, making a transparent background. Then I rename the files and and export them in PNG's of 3 different resolutions (low medium and high). The files come out with a white background instead of transparent and I don't know why, it only happens in certain files...

The work around I'm doing is exporting the PNG trough Photoshop, importing those PNG to Lightroom to batch export the other medium and low resolutions.

Does anyone knows whi this is happening? 

Thank you in advance!

[Theresa J]

I would use the Export As function in Photoshop.  Export as has the ability to export at mulitple sizes with one export. You can export transparent png images this way. Here is more information. 

https://helpx.adobe.com/photoshop/using/export-artboards-layers.html

[joao.pbm.cruz]

Thank you! I will try this.

[Rob_Cullen · Accepted solution]

Lightroom-Classic will display PNG files in the library, but it cannot Export files while maintaining transparency! So do not try!

LrC does not 'understand' transparency!

So you must use Photoshop to create PNG files of different sizes as suggested by @Theresa J 

[joao.pbm.cruz]

Thank tou Wobert,

I will do this method.

[phichakl18197330]

Adobe needs to fix this ASAP!