This is a callbackquery paginator

main.py

from telegram import InlineKeyboardButton, InlineKeyboardMarkup, Update
from telegram.ext import Updater, CommandHandler, CallbackQueryHandler, CallbackContext


def navigation_buttons_generator(index: str):
    navigation_buttons = [[InlineKeyboardButton("⏪", callback_data="minus_" + index),
                          InlineKeyboardButton("⏩", callback_data="plus_" + index)]]
    return InlineKeyboardMarkup(navigation_buttons)


def start(update: Update, _: CallbackContext):
    keyboard = [[InlineKeyboardButton("Short", callback_data="select_short")],
                [InlineKeyboardButton("Long", callback_data="select_long")]]
    update.effective_message.reply_text("Select what you want",
                                        reply_markup=InlineKeyboardMarkup(keyboard))

def selection(update: Update, context: CallbackContext):
    query = update.callback_query
    if query.data.split("_")[1] == "short":
        query.edit_message_text("Great, this is short enough to be in one message")
        return
    long_message_split_into_list = ["This is the first part", "the second", "third",
                                    "and fourth part of the message"]
    context.user_data["long_message"] = long_message_split_into_list
    nav_buttons = navigation_buttons_generator(str(0))
    query.edit_message_text(long_message_split_into_list[0], reply_markup=nav_buttons)

def forward(update: Update, context: CallbackContext):
    query = update.callback_query
    index = int(query.data.split("_")[1]) + 1
    try:
        text = context.user_data["long_message"][index]
    except IndexError:
        index = 0
        text = context.user_data["long_message"][index]
    nav_buttons = navigation_buttons_generator(str(index))
    query.edit_message_text(text, reply_markup=nav_buttons)

def backwards(update: Update, context: CallbackContext):
    query = update.callback_query
    index = int(query.data.split("_")[1]) - 1
    try:
        text = context.user_data["long_message"][index]
    except IndexError:
        index = -1
        text = context.user_data["long_message"][index]
    nav_buttons = navigation_buttons_generator(str(index))
    query.edit_message_text(text, reply_markup=nav_buttons)

def main():
    updater = Updater("TOKEN")

    updater.dispatcher.add_handler(CommandHandler("start", start))
    updater.dispatcher.add_handler(CallbackQueryHandler(selection, pattern="select"))
    updater.dispatcher.add_handler(CallbackQueryHandler(forward, pattern="plus"))
    updater.dispatcher.add_handler(CallbackQueryHandler(backwards, pattern="minus"))


    updater.start_polling()
    updater.idle()


if __name__ == '__main__':
    main()