In the last few days, I was trying to create some iOS shortcuts to send text, images and media to RemNote easily. This is what I was able to come up with. Will update here once I find more shortcuts. I don’t claim to have made these on my own. I have used others inputs and methods also.
This was the starting point where RNLY showed how to make iOS shortcuts. But since it was in Chinese I was unable to understand fully. Recently the discussion in this post created a new interest to make some shortcuts especially since the telegram bot was not working for me. @88DM88 shared how he used shortcuts to send images (via Imgur) and text to RemNote. With help of tips from @hannesfrank, I was able to use the ![]() syntax to embed the image from the Imgur url into RemNote.
After this, I was searching for a way to avoid using Imgur and instead save the images and videos in cloud services like Dropbox or OneDrive where I have a subscription and then embed it in RemNote using the URL. Finally I settled for Dropbox, because I remember having learned from @Badjer in RemNote Discord that you can embed images from your dropbox account in RemNote with slight modification in the URL (change the dl=o at the end of the URL with raw=1).
Then I searched for other similar iOS shortcuts in RoutineHub and Reddit. After I lot of mixing and matching, I assembled together a few shortcuts to send images and videos to RemNote as shown here. I had tested these only on telegram. And these were not working when I selected multiple images or videos. So the search continued.
Finally I made shortcuts which can send multiple images and videos at a time to RemNote through Dropbox using minimal steps. Again I haven’t tested this extensively. I have used it in telegram only. It seemed to be working in my short testing. It may work with other sites also.
Embed images (single or multiple)
Show Split Text in Quick Look can be removed if not needed
text field seen in the last image was filled with 
Rest of the fields can be filled as shown in these posts by @88DM88 or @RNLY
Embed videos (single or multiple)
Show Split Text in Quick Look can be removed if not needed
text field seen in the last image was filled with &[](Repeat Item)
Rest of the fields can be filled as shown in these posts by @88DM88 or @RNLY
I hope someone can improve upon this and find a way to directly embed images and videos in RemNote instead of using external servers like dropbox. I don’t know exactly, but I guess the twitter bot is able to save images and videos within RemNote server or database folder. @hannesfrank Can you suggest a better way than using Dropbox ?
I have also made shortcuts to capture image or video using iPhone camera and send it to RemNote via Dropbox in a similar way. Also a shortcut to send images and video from Discord to RemNote is there. I can share their screenshots if someone needs it (after some more testing from my part). I have to make one shortcut for sending text from discord also (not yet done). I also tried to make one shortcut to send images from Facebook private groups (study groups only) - but its little complicated. So not sharing that.
I guess more things can be done like uploading pdf (not sure though). Have to explore it.
Will add here if I find somemore useful shortcuts.