The latest build of PM+ (4705) continues the practice of attempting to upload to Flickr, SmugMug, etc. the .ON1 sidecar file when uploading a JPG produced from a raw image in ON1 Photo RAW 2020.1.
File -> Upload -> File Uploader
Select the source file and the destination. The upload is performed with the error shown in the attached screen grab.
Thanks for checking into this.
Bob
macOS Catalina version 10.15.4
iMac (Retina 5K, 27-inch, 2017)
Processor 4.2 GHz Quad-Core Intel Core i7
Memory 32 GB 2400 MHz DDR4
Graphics Radeon Pro 580 8 GB