A file doesn't appear after adding
Check the shelf for that file type. If you were previewing a folder in File Explorer, choose Add to Hub to copy the file into the library.
Help from a real person
BuboHub Support
Contact
Put BuboHub Support in the subject line so it reaches the right place.
Support form
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How to use BuboHub
Quick answers
Getting started
BuboHub is a library for files on your device. The gear icon is the main menu. Nothing needs setting up.
Adding documents
Gear → Add document(s)…, or use the Add button on any shelf to add just that type.
Supported formats
HTML, Markdown, Word (DOCX), PDF, JSON, text (TXT) and CSV. HTML, Markdown, text and JSON can be read, edited and shared. PDF and Word can be read and shared. CSV reads as a table and can be shared.
Favorites
Star a file and it shows up on the Favorites shelf. Your stars travel in .bubohub backups and over iCloud when sync is on.
Shelves and reordering
The 11 shelves are HTML, Markdown, Word, PDF, JSON, text, CSV, Favorites, Summaries, File Explorer and Categories. Drag them into your own order. Search sits first in the row but isn't a shelf.
iCloud sync
Sync is off by default. Turn it on for each device you want to sync; each device has its own switch. Your library uses your own iCloud. A count shows while files are still arriving. Changes show up on another device the next time BuboHub opens there. It isn't instant while both apps are open.
Summarize
Open an HTML, Markdown, JSON, text or text-based PDF file and tap Summarize in the header. Needs iOS 26, iPadOS 26 or macOS 26 with Apple Intelligence. Very long files are summarized from the beginning. Word and CSV can't be summarized.
Book
Markdown, text and JSON open in Book. On iPhone and iPad, slide to turn the page or tap an edge. On Mac, click an edge or use the arrow keys.
Categories
Baskets that work across shelves. Create, rename and delete them freely; deleting a category never deletes files.
File Explorer
Add a folder to browse and preview what's on your device. Nothing is copied until you choose Add to Hub. Folder shortcuts stay on that device.
Editing HTML
Open an HTML file and switch to the visual editor or the source editor.
Backing up
Gear → Save everything as .bubohub… exports your files, stars and shelf order as one file.
Restoring a backup
Gear → Open .bubohub… This replaces everything currently in the nest. Back up your current library first if you want to keep it. Folder shortcuts aren't included in backups and need re-adding on the new device.
Moving to a new device
Export a .bubohub, transfer the file, import it on the new device, or turn on iCloud sync on both devices.
If you delete the app
The library is removed from that device. If iCloud sync was on, your iCloud copy stays: reinstall, turn on Sync with iCloud with the same Apple ID, and it comes back. To erase the iCloud copy, delete BuboHub's data in your iCloud storage settings. Without sync, we can't recover it, so export a backup first.
Themes and text size
Seven themes: Cozy Nest, Twilight, Full Day, Dark Night, Space, Red Mode and Serious. Adjustable text size and library-wide search.
Troubleshooting
When something isn't right
A document won't open
Confirm the filename ends in HTML, Markdown, Word (DOCX), PDF, JSON, text (TXT) or CSV, then try adding the document again.
A folder shortcut stopped working
The folder may have moved or its access may have changed. Add the folder again from File Explorer.
A file was moved or deleted outside the app
Add the file again from its current location. BuboHub cannot recover a file that was deleted from your device.
A document displays oddly
Rendering varies by document. If you contact support, attach the file only if you're comfortable sharing it.
A backup won't import
Make sure you selected a `.bubohub` backup. Keep your current library backed up before trying the import again.
An HTML page looks too small or large
Use the HTML zoom slider in the gear menu.