I'm writing everything for this site in MultiMarkdown. Text is simply creating on iOS, but some of the features of creating photos and working with the Pelican host are harder than on a Mac. Here are some of the programs I use to make it easier with iPad Pro.
I often use Drafts to quickly start a blog post. I do not like to save text in Drafts because it's hard to get it from my Mac. I like Drafts because it's an expandable environment. Long ago I was a fan of Editorial for iOS, but it is not well maintained now.
While 1Writer does not get as much developing attention as Drafts, it has a big advantage: it works with text files and the iCloud Files app. I like to have simple text files that I can get from multiple apps.
I still use Blink to create AppStore links, although affiliate links are not really a thing with Apple. I just think Blink is a much easier and faster way to get a good link to an app. Unfortunately, Blink is no longer in AppStore. Sorry, you missed it.
Associated by same developer behind Blink is a very good app for searching and creating Amazon-related links.
I've moved many of the files to iCloud from Dropbox. I only prefer my contract with Apple more than my contract with Dropbox. Synchronization works fine, although the File app on iOS is less than I need.
The screenshots I take on my Mac are automatically saved to iCloud and synchronized with my other devices. The pictures I make on the iOS devices are also sent to iCloud.
I'm using DEVONthink on iOS and my Mac for research. I collect reference material and sometimes related images and documents and sort them into a general topic group in DEVONthink. This is ideal for long-term storage, since the search in DEVONthink is much better than iCloud search.
Long blog drafts are stored in DEVONthink together with the reference material. I also use DEVONthink for most of my bookmark archive. When I want to capture a link to be shared, I use the DEVONthink sharing extension to save it as a web archive. I've moved from bookmarking services like Pinboard simply because I prefer to own everything. Web archive also gives me full content search.
I notice content in DEVONthink with "bblog" so I can filter and find these elements easily.
I'm using Joke from Gladys for iOS and Mac. It is a much better clipboard processing than the original iOS clipboard sync. Gladys has the ability to break an object into iOS until it's parts. For example, if you drag a picture from a Gladys website, I give more than just a URL. I also get the red image file. Ever think you take a photo from a website, then drop it on an app and get the URL? Gladys solves it. It also sync everything to each device.
I almost always have Gladys as my Slide Over app on my iPad, and I use a lot of Gladys sharing extensions on my iPhone.
Annotable is awesome to add image ads and exclude sensitive information from screenshots. I usually only save the annotated images back to the Camera role for further processing.
CropSize is great for resizing images from the iOS image series. In just a few cranes, I convert a 10MB image to something easier to load on a mobile device.
PicSew is my new favorite tool for sewing in multiple screens in a continuous image. It's not fancy, but it works.
With each of these image editing tools, I save me back to the Camera role.
I publish on Macdrifter by printing files to the server using Coda on iOS. I prefer to transfer to iOS for SFTP, but it is no longer supported. Coda is good, but takes several steps to move files.
The nice thing about Coda (and Transmit on Mac) is that it uses panic sync to keep my connection definitions synchronized between devices. I keep separate location definition for raw markdown and the pictures. Coda's best feature is the ability to copy a URL for an image on the Macdrifter host.
When I inevitably need to edit to existing posts, I usually do that through Coda. Very rarely I will use Textastic with SFTP. I like Textastic, but it falls into a gray area. It's not as expandable as 1Writer, but it's not good for an SFTP client like Coda. It is a good editor, though.