OTG cable purchased but still cant upload RAW files to camera roll

[Bigsavi]

I have a Canon 90d camera and cant upload my raw files to Mobile Lightroom. I purchased mobile lightroom as it said you could upload RAW files via an OTG cable to your mobile. I can now see the files but they wont upload to my camera roll and therefore I cant get them into mobile lightroom... Very frustrating

[Charlie.D]

Does the advice at this other post help? https://community.adobe.com/t5/lightroom-for-mobile-apple-tv/ipados-13-and-sd-imports/m-p/11422526?p...