Cannot upload png photo files into media library. I get a ‘Could not insert post into the database’

there’s a bunch of possible reasons for your problem. I would check the following:

  1. Make sure that files you’re uploading are allowed by WordPress https://codex.wordpress.org/Uploading_Files

  2. It’s possible that you’re trying to upload files bigger than allowed by your PHP configuration – check upload_max_filesize and post_max_size settings in php.ini. If you do not have access to php.ini on your server, you might need to ask your hosting provider to increase the upload limit for you.

  3. You might have hit the size limit of your database, you need to check that in your hosting control panel.

Maybe one of these would help.

Related Posts:

  1. How to show all available images in WP’s media library when using the Polylang plugin?
  2. Saving Media – Which Hook is Fired?
  3. retrieve custom image sizes from media uploader javascript object
  4. Is it possible to allow zip files to be uploaded in WordPress?
  5. WordPress monthly upload directory owner set to root
  6. Set a maximum upload count for users on a specific user role
  7. Append button to WordPress Image Details modal
  8. How to set custom upload directory per user after moving content directory
  9. Importing WordPress Attachments Into Custom Directories In wp-content/uploads/
  10. add_image_size creating lots of images (of various sizes)
  11. This file type is not allowed. Please try another
  12. File Upload Permissions
  13. Setting the uploads directory
  14. Retrieving JSON data in ajax request from media uploader
  15. insert post & Upload post thumbnail from the front end using ajax
  16. how to add new .webm mime types
  17. how can i simple change upload folders to %year%/%month%/%day%?
  18. How can I save the original filename to the database?
  19. How to side load an image from a service
  20. Regenerate thumbnails unexpected resolution (96 x 96)
  21. How to host different file formats/types for a media attachment without creating multiple attachments?
  22. Can’t write pdf file to upload directory using FPDF
  23. Change default uploads file using wp Skeleton
  24. Change default from “Attachment post URL” to “File URL” in Add Media
  25. how to use media library [closed]
  26. Adding Adobe files to a wordpress site [closed]
  27. What types of files can I upload with the WordPress Uploader?
  28. Replacing Images in Media Library
  29. Creating a feature to upload multiples images in the Theme Options?
  30. Copying uploaded images not working in wordpress
  31. Disabling direct access to images using .htaccess
  32. Restrict WordPress Media Library for a specific user role (users can only see/select own media)
  33. Manual filename while uploading attachments
  34. Convert (-) and (escape) signs to (_) when uploading files on wordpress media library automatically
  35. Make WordPress compress full size image?
  36. Move files from flat upload directory to organised by year / month
  37. Can’t manipulate media uploads
  38. Alternative or workaround for wp_insert_attachment
  39. How to limit the number of simultaneous media uploads?
  40. Custom media uploader not showing library
  41. Symbolic link for uploads in wordpress
  42. Upload iPhone video clips to blog via native WP app
  43. Process uploads with phpThumb before generating thumbnails
  44. Resize existing library images
  45. WP 4.3.1 new install on localhost missing php.ini [closed]
  46. Large image upload size (using timthumb.php
  47. How can I manage and limit disk usage for each author?
  48. How would I change the 10 MB limit to 5 GB in this script?
  49. Media Library Won’t Display Any Images
  50. When does WP resize an image file
  51. How can I modify the media upload form fields?
  52. More Fields & Media Upload
  53. How does wordpress handle media files?
  54. Upload Custom Mime Types in WordPress (SVG, WebP)
  55. “Sorry, this file type is not permitted for security reasons.”
  56. Can upload through FTP but not through WP uploader
  57. upload_max_size doesn’t change
  58. Upload and attach to a post multiple image files [closed]
  59. Changing titles in Uploader for “Posts”
  60. WordPress upload file action hook
  61. Back up uploads folder outside of wp-content?
  62. Batch upload to create posts each with one image, headline, and body text
  63. Control resizing of uploaded images
  64. How to upload prc file type?
  65. How to add an upload image button (just like the one in the Custom Header) in the Theme Options I just created?
  66. protect files from downloading on other than my site
  67. How to add CSV upload functionality on the edit page of a Custom Post Type
  68. WordPress changing media file name upon upload
  69. How to remove media by filename?
  70. Restrict Users to Only Edit Media Owned by Users in Their Role
  71. media_handle_upload() returns Specified file failed upload test
  72. How to upload a file and have it available on the post for download?
  73. WP media upload issues
  74. Increase .htaccess file upload without prompting error
  75. Images uploaded via Gutenberg image block are cropped
  76. WordPress upload folder stuck in 2017
  77. Moving wp-content folder to public_html
  78. An error occurred in the upload. Please try again later
  79. Using Gravity Forms to upload media into library, then attach to post
  80. Some images not appearing after switching from AWS S3 back to local
  81. Uploading a file results in attachment post, but file is missing
  82. Why I am not able to upload media files?
  83. Featured image to grayscale with PHP imagefilter – which hook to use?
  84. Store uploads on an external server?
  85. Force relative path in media library for LAN deployment
  86. WordPress Media manager select file button, how to prevent hiding?
  87. Make thumbnail from uploaded image without plugin
  88. Making Site A Use Site B’s wp-content Folder
  89. Limit number of uploaded attachments of specific context
  90. Set featured link not showing
  91. WordPress upload folder on separate server
  92. increase maximum upload file
  93. How i can upload images to another folder?
  94. make default upload folder year/month/day wordpress without plugin [duplicate]
  95. Display Image Upload from Contact Form 7 on Redirect Page [closed]
  96. media_handle_sideload() fails
  97. How to upload and add images to the existing post from the front-end with admin approval which is posted by other user
  98. Updating Media Library PDF’s in bulk
  99. Assign multiple categories to Media Library upload
  100. Update media item using wordpress rest api in python
error code: 523